This is probably going to sound a bit wacky and complicated (and it is), but you can actually
use the options market to borrow against equity collateral at extremely reasonable rates (right now about 4.5% APR.) If you're worried about the collateral (AAPL stock) losing value, you can sell call options against that to de-risk further.
It's probably not worth learning if those RSUs are only like +20% in LTCG, but if you've been holding them for a good long while and they are 90% LTCG, and you have ALOT of them, it's a super nifty trick to learn. It could also help your heirs become a whole lot wealthier if they can inherit your RSUs at a stepped up basis and just pay off the accumulated loans.