My cobbler put a size larger tree in my shell short wings, with a split toe. He maintains that you want cedar to contact as much leather as possible and no worries about shell stretching so you can have the added pressure. The tree is large enough that the split in the toe stays together, so in that sense it does not matter if it is split toe or solid.
I can get the same tree on Amazon as from my cobbler, I only bought a boot tree on Amazon it has a higher arch to fill the toe box height. Footworks cobbler does not have those boot trees, he says he will shave down a larger size tree to fill a shoe - I own sand paper too if thats what works best I will DIY. My Citishoes Aldens came with a split toe tree and it is very small compared with my other trees but it does fill the shoe and maintain pressure all a round , with the exception of the toe split area. When you get into such exacting specs I feel like I must be talking to an Audiofile - they just obsess over trivial matters since the gear cost so much.