OK, lets see about some of your ideas.
1) How much longer do you have on H-1B?
What nationality are you? They project EB-2 to be backlogged for India & China by December. You should get a PERM EB-2 filing on the way ASAP.
I am from India. I have 2 years left on my H1
Where is this EB-3 coming from? From the BEC? Good luck - it may still take a while. So far India & China are backlogged severely in EB-3 and all other countries are unavailable. Therefore you most probably cannot file I-485 at the time you finally get the BEC LC (unless it takes so long you date becomes current again).
I am not sure where you see a 'good part' in all this. You cannot get EAD at all if you cannot file I-485!!!! and that is very unlikely given your EB-3 plan. Yes - I do see major problems with your plan. Lets say hypothetically speaking you get an EAD because you somehow miraculously happen to be able to file an I-485 based on a 'shaky' EB-2 I-140. As soon as that gets denied your wife loses EAD and would potentially have trouble getting back to H-4 again (new filings/petitions). It would be worse if she had to quit her job very soon again then if she had never started I would say.
I see your point. But to save some of the shakiness coming from EB2 filing, I'll be filing EB3 also for I140 at the same time (it is allowed by law). So because I filed a shaky EB2 too, I'll be able to get EAD. The EB2 I140 will be dinied and EB3 will be approved, so ultimately it wont adversely impact my overall gc process (that is what I think, although I'm not so sure)
I admire your optimism and wish it would come true.
Your best bet I would say is to get a PERM EB-2 on the way and set yourself up for future success. All these other things either don't work outright or set you up for more problems. Once you have the PERM LC file I-140. Once that is approved you have a PD for all future filings and can extend H-1B in 3-year increments if visa numbers are unavailable.
I know I'm being overly optimistic, but there is 1-5% chance of it coming true and I'm working on the assumption that this will be true (my lawyer thinks that the approval will come in next 6 months for sure) . I'm going to file PERM EB2 too, but it will be at least sept 30 before I can file (due to huge documentation and lazy lawyers at my company). But again, once this one is approved (assuming 3-4 months time it takes for PERM approvals) - EB2 category will become backlogged too. So this route wont probably give me EAD soon - which is what I'm looking for.
Please let me know what you guys think.