i never could get an answer on the cost. most places wont touch one off stuff like that. they are used to running massive ovens full of the same type object.
also, getting an answer on WHICH treatment process is best is a toss up. aging, solution, precipitation, ect.
this is probably the reason 99% dont mess with it, and on frames that ive seen fail, looks like design or weld quality is the culprit.