There may be several flies in the ointment. From checking the physical dimensions of the LCDs, it seems that the Portable and the 100 differ a lot (1", diagonal measure). That alone may make swapping a bit of a challenge, even if the electrical connections turn out to be identical (something which is yet to be determined). I don't know if the 100 would physically accept a Portable display without major (or impractical) modifications, but if you happen to have all the pieces before you, perhaps you can make that determination.

You are navigating uncharted waters, my friend. I hope your pioneering experience ends more happily than it has for some other pioneers... !