Rowan Engineering - questions about multiple parts for HW97k

I know there are several people that use their set back triggers. Anyone use their extra set back? Is the trigger adjustment screw still accessible? 1cm back from the original is quite a bit....but I think it is the right one for my short fingers. I wish I could try both, before deciding which one to buy.

Is their trigger guard strictly a cosmetic part? Or is there some sort of accuracy performance to be gained by using their guard? The Weirauch piece is cast, and not flat/straight where it mates to the stock. The Rowan piece looks flat/straight....is there some advantage to that?

Their cocking handle...there is a scallop/clearance radius where it is needed to clear the muzzle weight....is this another cosmetic only part? I would think the edges where this clearance scallop meed the outside diameter of the handle would have a sharpish edge, making it less comfortable than the original non-handled cocking arm.

Any info and/or opinions appreciated. Thanks.