This is tricky.  The rules are sketchy and IRS “could” claim since you took custody that its no longer sheltered.  I had this EXACT conversation with a senior manager at Bernstein. 
Swan offers a custody solution for a fee 
Unchained offers a self custody option that id be more comfortable with now that the political landscape has shifted towards btc friendly policy.
None of this has been tested yet.
👊🏻🍻🧡 

 Interesting and thank you - I was unaware of that while in the process of setting up a 'Roth' Unchained.

I would think eventually the law will have to face the realities of self-custody and the implications thereof.

But that doesn't change my sentiment nor potential vacation plans. 🤣