An Ambidextrous Safety Selector is slated to be "Coming Soon" from Partisan Triggers.
https://partisantriggers.com/parts/
You can use an ambidextrous M-16 3 POS safety selector, but you will need it modded for a FRT. Datum Machine Works can do the modification for you or you can purchase one from them.
Datim machining makes a ambi that will work with this. So yes. There is a ambi safety available.
This should work with any three position safety. Raidian makes one that should work.
Well, I have two of the Partisans and I use the Rare Breed ambi safety with both of them. Works like a charm. No modifications necessary. The safeties can be ordered as separate parts from RB (about 50 bucks).
It’s hit or miss with the M16 Ambi Selectors. I bought 3 triggers and the M16 Ambi selectors worked fine on two of the triggers. It was a no-go on the 3rd.
Plenty. id go with a classic, colt ambi safety.