Madisontrust.com is the web site of the custodian of record for Broad Financial.  I used them.  Constructing an operating agreement for the LLC is a bit...levered.  it is probably worth paying for advice on that, if you can.

If your crypto is in a Roth you can't use it, but you can borrow cash from the account, and pay yourself back with interest, potentially on a rather long-term plan. Again, the subtlet is suggest legal advice is warranted.  After age 59.5 there are no limits on withdrawals.  Inheritance can be complicated, so consult a professional about that, too.  (Or at least give seed words to your inheritors or executors, so they can dominate any arguments.)