Yes, this particular pump is a 'regular' Alpina pump PL04-129.10 727 from a 1977 E21 Alpina A4/3. My research leads me to believe that this pump is the only Alpina street pump that actually has a different cam inside-- and that this cam is richer in the mid-range and leaner at high RPMs for emissions. Alpina pumps for A4 engines and even A4S engines did not have a special cam, they were only modified to have 2.5 bar pressure.
I sent the pump and throttle bodies to Mike because I bought them out of Germany and thought it would be efficient to send them to the UK 'on the way'. (Didn't work out that way). I also wanted him to tweak the pump so it wouldn't be too lean for my A4S engine.
I agree that the places you mentioned in the US can do a good job on a regular KF pump but they can't/won't modify internals the way Mike can, so depends on what you need. As for throttle bodies, they shouldn't be too complicated but I found it a little tricky to find someone in the US. You mentioned Eurometrix, who have a great reputation in the Porsche world and a price to match.
I reached out to all these places about a year ago and here's what I found:
Gus Pfister 8-12 weeks, doesn't do throttle bodies, $1400 (as of 2017)
Wes Ingram 8-9 months, does do throttle bodies, $1425+
Saxon/Kugelfischer.nl (same people), does throttle bodies, 1800-3000 Euro just for the pump rebuild
Koller+Schwemmer, so big they're hard to deal with, never could get the right guy to get back in touch with me
Lucas Development - ?????
In general, I found the guys in Europe to be more knowledgable about what has been done/can be done with KF pumps in specialized applications.