Two points;
Thread sizes- Most of the thread sizes you mentioned will make the suppressor stick quite a bit further forward. If the OD of the smaller thread is close to , or greater than the ID of the larger thread, then they will not be able to overlap and you will need to put one thread at each end of the adaptor. Otherwise there will be no strength in them and it will be like tin foil.
If you do go down the adaptor track, one tip would be to put a Screw driver slot on the rear (muzzle) end. Both threads on it will be in the same direction and you will need to be able to remove it from the inside of the suppressor sleeve in the muzzle thread is the one that releases first. With the slots on (as in the quick diagram) if that happens you can undo the adaptor with a screw driver or make a blade to fit it.
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