Is this a feature request? In that case, there's a while do loop already.

If this was just feedback, then yes, I think it's nice too.

it is a feature request, and your "while do" is not like a "do while", and it can't be used or better misused to build a "do while".

Reason is the nature of the "do" needing some construct in front.

Ah, right you are.
But would it be much different than:

while {true} do {
   //code
  if (condition) exitWith {}
};

or:

while {
//code

condition
} do {};