Fire mode conversion on a HK USPc

Has anyone done a fire mode conversion on a HK USP compact himself?
The manual says it needs to be done by a HK certified armorer.
Are the parts available to do it?
What does a armorer/shop charge for this?
Like to try to go from Variant 7 (LEM trigger) to a ‘normal’ SA/DA
with decocker.

I changes from V1 to LEM in a USP40c years back. Got the instructions via an internet search. It's was not hard. If you are somewhat handy and/or mechanical you should be fine. I sold that gun.

Where did you get the parts?