Split boards and ice climbing

I have no experience skiing but do have some experience snowboarding and I am researching the idea of investing a split board with the idea I could C.C ski up to my climbing destination, do my climbs and board back down. Anyone have experience with this? Worth the investment? Best Boots and bindings?The ultimate goal will always be to climb but looking at options for the hike in and out. Probably most climbing will be done on or around Mt. Washington. 

Hey guys I have a question. 

That being, how should hard boots boots fit if I’m going to incorporate ice climbing as well as general riding and touring? 

I got shell fit for a 27 backlands carbon and a 28 backlands carbon. The 27 fit me with 1 finger and a tiny bit shell fit (under 1.5 fingers, maybe like 1.2 or 1.3). The 28 fit me with a nice 2 finger shell fit (snug 2 finger, but not too snug). 

Should I get a 27 or 28? Will heat molding a 27 with an 9mm intuition liners with 2 toe caps and an aftermarket footbed (which slightly increases volume but reduces length slightly) work for the climbing (split mountaineering) as well and give me a better performance on the downhill? 

Or is the 28 the way to go to give a slight bit more space for kicking ice? But what if after I wear out the liner on the 28’s and want an intuition liners, will it work in that shell, since some intuition liners work better with a tighter fit. I could go for a 12 or 15 mm intuition liner though. 

I didn't try the 27 on with the liners in, only shell fit. The 28 fit me well with the stock liners in. When standing straight my toe was just pressing into the front, and then when I bent my knees to a riding position, my toes just pulled off the front (were barely grazing the front). But what would happen with a heat mould and a footbed? 

I eventually want to have a quiver of boots, one for touring and riding, and one for split mountaineering. Would it make sense (not financially, just optimality wise) to have a 27 in either a backlands carbon, Pierre Gignoux Black Snowboard, or maybe a SplitPin make sense for only touring and riding and no climbing? Or does it sound like the fit for the 28 is adequate and would work with 12 or 15 mm liners for this purpose as well. I am unsure of the exact stock linker thickness on a pair of Atomic Backlands Carbon Boots.

I am a bit lost in all of it right now lol, so I really appreciate any and all help!

Thanks!