It is possible to exclude yourself in the way OP said, but unfortunately, as OP said, you cannot use stable coins to distance yourself from the risk of fluctuating crypto prices.
In my opinion, whatever method a person uses to exclude themselves is very good, but it all comes back to the desire and commitment of each gambler because it would be in vain if a gambler staked the budget he has because if his mind still has the desire to gamble, of course he has other methods such as tried to gamble, borrowed a little money from a friend and gambled secretly.
A strong desire is an important role for gamblers who want to reduce their gambling activities so that in any way gamblers can very easily limit themselves so that they get into the habit of not gambling too often.
If you do try to understand the sentence about in between stable coins and other crypto then it wouldnt matter on which as long whats available then you would really be simply stake those amounts.
If you do see that stablecoins are the only available on which you can stake then you could really make out those conversions if you are really that serious on staking those funds just for the sake
on avoiding for you to play with gambling but if not then you wouldnt care as you could really be able to play again on the money that you do have. Some sites do offer exclusions on which there would neither be a duration or would be completely deleted or prohibiting you on playing but since creating new account would be so damn easy then this is why i can say that
self exclusions are really that useless or not really that effective at all.