Im still holding out hope that the Gen 2 USP is coming out soon.
I've owned more HK's over the years than I can count. Eventually strayed from them based on overall cost, and when I started shooting Glocks as good or better than my HK's.....
Still have an absurd appreciation for them though, I just cannot stand their non-match triggers. I had a P30LS at one point, and the single action trigger travel was quite a bit longer than my Glocks overall travel. The reset length of the P30 was just a touch shorter than total Glock trigger travel.
The match trigger on the other hand is a suitable trigger, and actually quite nice.
Unfortunately, HK hasn't really developed that trigger to fit in anything other than full size USP's. The HK45 I believe got a few of the match trigger components, but not all of them, but it too is suitable.
Otherwise, LEM trigger unfortunately seems to be the way to go.
That being said, if you're not used to a striker style trigger, its entirely possible the standard trigger will be alright for you. It just wasn't for me.