There is no way of getting around the fact that the rifle only fires when the trigger is squeezed each time.
Semi-auto does not equal auto.
No way around that fact.
I remember when I could go to gun shows and buy 16 bolt carrier, selector, 2 or 3 other pieces, and make a drop in sear. Trouble was I couldn’t hit much, lifted up and wasn’t worth the trouble; except on New Years Eve.
If you add parts that trip the trigger on a semi (all original parts installed and unaltered) and make it full auto, then that semi auto is classified as full auto.
See lightening link, shoe-string AK, etc.