Forex is already dangerous, crypto is dangerous on top of that, doing forex trading with crypto would be double dangerous. You are getting square root of dangerous with one move. I would say if you are in crypto, stay in crypto, if you want to move to forex then move to forex but do not do both of them together somehow. You could really lose a lot and there is no reason for that.
I am sure there will be a market for frex with crypto eventually, instead of spending dollars or any other fiat you use, you will be capable of spending bitcoin on the moves you make, it will probably exactly be like any other forex website but instead of fiat there will be a market for crypto. Until that moment do not use fiat forex places that accepts crypto because it is neither nor situation there.
you could be mid-, or long-term invested in Bitcoin while daytrading Forex. why not use the Bitcoin which are "locked" anyways?