So you think I will gain, about the amount of space that my insole detracts?
Of course yes. You said that is all right with the length. Bottom part of the liner almost 6 mm thick, and over your big toes the liner has the same thickness. It can be molded to the 2 mm, so you have a 8 mm gap. It is bloody huge gap.
Toe caps are necessarily if the problem in toes area. But problem can be with dorsum where blood vessels are. In this case heat mold will help you more easily. You can do it first with two pairs of sox, than try with toe caps.
You can make toe caps by yourself.
Tutorial: Molding Intuition Liners