The parts are all available at HF and doubt crosman would beat their prices, putting in a package. I also don't get the sense that many people are using a pump assist. The tank will make shipping costs high. Most PCP seem to be sold online vs store. I think running directly from a compressor is not that appealing. If you don't have a compressor, running to the local store to get the tank pumped up, is a pain. From when I use to do that, many pumps didn't put out enough pressure.
Even if cosman comes out with the bullet proof pump, it will take a long time for it to gain acceptance. They have such a bad rap now, hard to see them overcoming that. They announced a new turbo aire pump about two years ago, but still not available:
http://www.crosman.com/gear/pcp/HPP3KU It appears to be some type of double pump with a moisture filter. It is reported as to having problems, and might not be released at all. Hard to see people passing up a hill to buy that one.
At this point, making an "idiots" guide to make pump assist system, might be a better approach. Listing exact part numbers, and assembly instructions, and use guide. We could lobby the forum owner to make it a sticky.