"On a 1040, the AMT vs regular tax difference for FTC has to do with the limitations calculated on the 1116. The gross foreign taxes paid is identical for both, so no special input is required."

That doesn't sound right.   Per 6251 instructions:  

Line 8—Alternative Minimum Tax Foreign Tax Credit (AMTFTC)

The AMTFTC is a credit that you can claim against the AMT. You will figure the AMTFTC using the same limitation rules that apply to the foreign tax credit for regular tax purposes, but with AMT amounts. However, you may be able to simplify your AMTFTC calculation by electing to use some of the same amounts you used to figure your foreign tax credit. 

So you are right!  thank you, Phoebe!

What is the purpose of the passthrough entity, a trust in my case, listing the AMT FTC in a footnote?