Ask for 30-day paid leave of absense. You stay on during this time as an employee at your current role, so doesn't disrupt the financing.
IF they say Yes, then enter the agreement in good faith and be on standby during the 30 days. Maybe they'll end up wanting to extend the deal another 30 days. A the end of the 30 days, YOU decide whether to go back to your role or put in your 2 weeks.
IF they counter with lower pay during the leave of absense, then say OK but I want my stock options secured.
IF they fire you on the spot, then they deserve whatever pain they get.
Tell your team you intend to return to your role, but the writing will be on the wall.
Basically you're offering the company on-call transition consulting, in return for some extra vacation pay. Win win situation