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NBC or 3Cs could easily be climbed in AT boots, though typically ski conditions are very poor when these are in good shape (as Gene points out). I climbed both in plastic boots after walking in during good spring conditions. I wouldn't want to climb a long rock arete in AT boots and haven't. I save those routes for after the ski season. I guess I'm a firm believer in climbing routes when they are in the "best" shape, i.e. the most enjoyable. This can mean other parties, but I'm OK with that. If you want solitude during the busier season, you can always go during the week.

Trip: Mt. Stuart - Ice Cliff Glacier Trip Date: 04/20/2019 Trip Report: Jacob Krantz and I climbed the Ice Cliff Glacier (AI2, 60-70 degree snice) on Stuart on April 20th in 21+ hours car to car. We climbed three pitches of mostly steep snice and a little AI2 on the left side of the lower ice cliffs. The upper couloir was sustained and exposed at 50+ degree snice with a short bit of true WI2, but very secure climbing. The right hand exit had no cornice issues, although massive cornices still loom over the majority of the couloir. We chose not to go to the true summit since it was in the clouds and we were tired. The descent down the couloir to the Sherpa Glacier was extremely icy and grabby on skis and we actually chose to downclimb some of it. Lower glacier was awful breakable crust. All in all, about 24 miles, 8000-9000 ft gain, and one wild day of suffering and adventure in the mountains. For a more detailed, TR, see https://climberkyle.com/2019/04/20/mt-stuart-ice-cliff-glacier-ai2-60-70-degree-snice/. Entering the broad basin at 5400 ft. Looking up at the Ice Cliff Glacier. Starting up steep snow to the base of the cliffs. Leading up through steep snice and easy ice. An incredible setting! Looking up the exit couloir. We took the notch on the right. Soloing a nice AI2 bulge in the constriction in the couloir. Topping out on the route! Our little "summit" for the day. Sherpa Peak. First few turns into the couloir. It only got steeper and icier... Spooky loose wet slide that took out our skintrack through the woods, on a NW aspect in the basin around 5400 ft. Must have happened during the late afternoon at some point. Gear Notes: Used 2 pickets, 5 screws. One might want more pickets if you want to protect all the steep snice. Approach Notes: Road was skinnable a little before the Eightmile trailhead, but melting fast. We kept skis on all the way to Stuart, although just barely in places. Creek crossings were generally easy to find. The section after you leave the Stuart Lake trail is brushy. Be prepared.

why bring anything at all? most times you can just do them by walking in. the two routes listed has a standard bootpack going in to lake which is a pain to ski anyway, often in in late winter. I have seen alot of people packing skiis up to the lake. so for colchuck and dragontail, you would have 30 minutes of useful snow slide time before getting on route. The reality is that the snow is so deep that you need floatation, you really need to reconsider the route choice due to avi concerns. chair and baker often have bootpacks approaches also. Being able to walk on the approach without flotation is a good sign that the actual climbing route is in good condition. Things usually get more difficult the higher you go. If you are wallowing down low, expect more wallowing up high. steep wallowing is a good way to die.

I have had good luck with my mountaineering boots on a splitboard. If you get a small enough binding a La Sportiva Nepal works very well (definitely put in a dozen or more trips with that setup). I even used La Sportiva Spantiks with my splitboard up on Denali. I wouldn't want to ride those in the resort but as you stated you aren't looking for beautiful backcountry riding just efficient snow travel.

There is no secret miracle gear for the shoulder seasons. Most (including me) use skis until it isn't fun, and then at some point in the year transition to doing trips with just boots (I typically leave the skis at home after early/mid June or so). Modern AT boots climb just fine, at least if you aren't talking a lot of fifth class. It seems, at least to me, that the rock routes are typically in poor condition that time of year anyways. You can find a lot of good options in used AT gear, esp if you aren't super picky.

That's a proud ascent, well done!