Not a smart move
This is probably legal but not a smart move.
You have the burden of proof for the following to the BICS:
1. Your wife business is viable, secure, and profitable for the foreseeable future. This requirement is the same for any businesses that hire i485/EAD applicants. Being a small business, the burden of proof is abnormous. This is also why people like us, GC applicants, prefer to work for big companies for GC purposes.
2. Your wife's business bypasses the RIR process when she hires you. This will not fare very with the BICS. In order to be compatible with all other applications, the BICS may also require you to prove that your wife cannot find any local to fill the vacancy with similar qualification.
3. Your new job descriptions must match those you have on your i140, with your new salary not much less than your current one.
All in all, this is definitely not a smart move. If your application is denial, your wife's case is automatically denial as well.
Good luck,
Lea