There is no law that says you have to accept direct deposit or cash
their cheque.....
Your ELIGIBILITY for ODSP stems from:
a: Being a resident of Ontario
b: A determination of 'disability' from the DAU
c. Your financial status
d. Your adherence to their 'rules'
You RECEIVE ODSP by being both ELIGIBLE and REQUESTING IT
(application).
Violating 'd' gets you suspended in a punitive or coercive sense (the
suspension ends when you comply).
Changing 'c' makes you ineligible until it reverts back below the
critical level.
Once granted, I can see no way to change 'b' without some risk of
being charged with fraud in the original application.
Ending your residency in Ontario would definitely do the trick.
Requesting to withdraw your application (or not cashing the cheques)
might cause an inquiry into your capability for self-determination,
but that would require a very conscientious worker.