Let me being clear on this: You want to hire for a IRA option to invest in crypto. As i have understood untill now, one of the benfits of an IRA applyment is get some deductions when you pay contributions. In my opinion you must divide the amount and use a half to invest in Crypto and the other half use it for a IRA. So, you will get a good bitcoin reserve where you can use a significant percentage to invest in good stock, and then, with the resultant gain you will deposit on the IRA, where you deposited previously the half. Once you made this all the times you want to get a good retirement plan, you will be done...
And the better part of this is: You can administrate the money better than a third part service...