H-1B Layoff situation with COS to H-4 + H-4 EAD available

[Buckeye_OH]

Situation:

1. Was on H-1B and layoffs happened - now in 60 day grace period. 

2. Spouse has H-1B with approved I-140, so eligible for H-4 & H-4 EAD. 

3. Was on H-1B from Oct 2016 to now. Before that was on H-4 + H-4 EAD (tied to spouse’s company A). Since then spouse has moved on to employer B on H-1B. This H-4 EAD is valid until Dec 2018, however I’m guessing the H-4 is not since I changed status to H-1B in 2016. 

 

Questions:

1. Can I work on previous H-4 EAD anytime from now until Dec 2018 and in the meantime apply for COS from H-1B to H-4 + H-4 EAD?

2. I’m in the 60-day grace period for H-1B, does this time after last day of employment cut into my 6-year duration of H-1B?

3. If COS to H-4 + H-4 EAD is applied and in the meantime, I find an employer willing to file cap-exempt H-1B - do I have to wait for H-4 COS to complete before filing H-1B, or can I ask the employer to file for H-1B and revoke H-4?