The safety can be easily disabled or removed, removing it will not require any alterations to the parts so you can put it back someday.
The trigger can be vastly improved but it has to be done the old fashioned way buy stoning the sear and hammer. Not for the novice.
I've put recoil pads on the crescent butt guns before but it is an undertaking. And you can't go back once it's done. Take the butt plate off and cut or grind the crescent out of the buttstock but stop right at the bottom of the radius. Now put your butt plate back on, only the top screw will have anywhere to go, and scribe the top of the plate and cut it off level with the butt so everything is straight. Now install pad like normal and grind to fit, you just have a steel heel plate on your comb. It sounds weird but actually looks better than if you tried to graft in some wood and if you just cut past the heel plate you'll have a super short LOP.
