this weird contraption already exists, but because it places the actuating lever toward the rear of the fulcrum, the mechanics are all backwards. turn safety off by pushing up, just seems like unnecessary divergence from accepted norms for muscle memory on the ak platform.
if the lever were made so that actuating surfaces were forward of the fulcrum then the entire manual of arms would stay mirrored. with us palm style lever that allows the index finger to flick off safe while maintaining fire control grip the whole platform is improved for both strong side and support side.
The linked device only works on rifles with no side rail.
It requires a permanant modification to the reciever.
Two no-go’s in my book.
The tabbed safety you call out was first used by Marc Krebs, and copied/mirrored by Black Jack (makes buffers too).
US Palm copied Solar Tactical who offered just the tab to rivet to your existing lever, again a permanant modification to the rifle.
Even if you had a Krebs safety mirrored into the left side of the rifle you could not use it with your thumb without breaking grip (right handed). They sit much too high up. The only really good way to do an ambi safety in an AK is to use a Galil type thumb lever. The only man who used to offer that was again Marc Krebs. It was prominently featured on his original KTR-03 and subsequent KTR-08/09 rifles and is an extensive and expensive modification. I have it on one of my rifles and love it, but wouldn’t nessesarily do/pay for it on my others.