For the P30, V3 with GG SRT. Solves the long reset of the V3, far superior to LEM on the P30 for the shorter and much crisper action, compromises nothing on safety. If you go LEM you have to go all the way- and you permanently give up fast split times with accuracy.
LEM is, after all, a way to stop law enforcement guys from shooting “too quickly”- it’s a deliberate impediment to the trigger action. That’s a training issue for LEO‘s “solved” with a hardware solution, rather than (expensive) training (software). That isn’t an opinion, it is a fact.
I'm sorry, but the P30-has-a-long-reset people will forever tickle me. The reset is about the same as a Sig P226 or CZ 75B, which have been used by law enforcement, civilians and competition shooters alike for decades. If you are actually a fast enough competition shooter that a few millimeters of travel makes a difference in your times, then I would wager you're in the top 1-2% of skill level among all HK owners. I'm not going to dismiss the need for short reset kits, but most people who buy handguns are not buying them to win competitions. OP is even looking at the SK model, so he sounds like a pretty ordinary shooter (not an insult!). So, I'm just tickled to hear you refer to the P30 trigger as a problem that needs solving, when it's about as good as several other DA/SA triggers that would be on any gun store shelves. And IMO, the DA pull on the P30 is smoother than on a CZ 75B.
As for LEM being designed to "slow down officers," that's a first for me, but I don't believe it's correct. I would need to see some documentation to be convinced that it's true. Some people will probably nitpick me and say there's a micrometer of difference since they use different sears, but IIRC, the reset is exactly the same from P30 V1 to (unmodified) V3. The reset on the USP, from V1 to V7, feels likewise exactly the same--and again, I'm sure someone will nitpick about how it's not "exactly" the same, but it's close enough that I can't tell the difference.