I used to be a snowboarder and a few years ago I asked about a splitboard setup and I think it was Sol who told me, "skis" and I listened and I have never regretted it. Especially since having spent a couple of trips with splitboarders -- if you are not a serious snowboarder anyway and just want it for climbing (easy up, easy down) you will have an easier time with skis. And this is coming from a former snowboarder. When I've been with splitboarders, they've always struggled way more than me on the flatter parts of the descent...for obvious reasons. It looks very awkward, I'm glad I don't have to deal with that. I'm really glad I took Sol's or whoever's advice it was and took some ski lessons instead! Never looked back.
Sorry, I know I didn't answer your question at all and I'm rue it's not helpful but it was worth saying. just my lousy $0.02
That said, there are some badass splitters around so hopefully they will help you. Cheers!