OP can simply use an electrum wallet but even if he uses exchange<=>Electrum<=>Casino still the exchanges will find the transaction based on tracking and will freeze the account especially the coinbase.
Seems yes, maybe the user may set the table like this : exchange<=>Electrum<=>Mixer<=>Casino, vice versa
Better if it goes like this
exchange<=>Electrum<=>Mixer<=>Electrum<=>Casino
Because casinos also can freeze our account if it comes from mixing website due to AML policy.