Are they looking for just the stamp or all of information on that page. I like the idea of having is shrunk down to a credit card size for the wallet.
You do not know who, when or where you may be asked to see the paperwork. The simpler things are for the LEO, the easier things will be on your end.
This is the reason why I have my forms in my individual name, but I'm lucky that my sheriff will sign off on NFA items. If someone stops me and asks to see the paperwork, I have a full size 8 1/2 x 11 copy of my form with the sheriff's sign off on it. That will satisfy most LEO's if they are looking at it. If I'm on the side of the road with a rookie, that probably is not the time to start having to explain the ins and outs of trusts and the NFA, or he or she is going to let the NFA holder explain it to the boss downtown. Just my take on it. Keep it easy to read and simple for everyone.
And a side note, don't judge books by their cover. My sheriff is black, a Democrat, in Travis County. I've meet with him twice in person for NFA sign offs. He is professional and personable and told me he likes good citizens to be armed as it helps them. He is a good man.
The white "conservative Republican" in the adjacent county, Williamson, does not believe citizens should own NFA items and will not sign off.
So, take time to meet people and judge them by their actions, not their color or labels.