Your 485 is an employment based 485. If you earn your salary, from something other than being direct employed, thru a W2 that is, you no longer meet the criteria.
For a business based 485, there is a seperate category, in which you should have invested a min. of 1,000,000 $s and employed atleast 10 US citizens, and then you can file for your 485.
One thing you could do is, start a biz, and put all the earned money in a trust, where you can't access it, and then get it all once you get your GC (as a salary or whatever). But in this process, don't loose your fulltime job.
Another thing you can do is, start a biz, and work for it on EAD, but if INS sends RFE, and starts asking for business credentials, then you're in deep doodoo. And that is not very atypical.
If you *must* start a biz. today, start it, and let your wife manage it (or h4 husband I don't know). While you keep your FT job. Also realize that there could be EAD lapses.