Other then replacing the 1/0 with 3/0, what can be done to remedy this issue? Maybe something like parallel cables in 250-122(F) (2).
250.122(F)(2) can not be used for raceways, cables only.
Strangely enough the only code compliant remedy short of replacing the 1/0s with 3/0s would be to simply cut off the 1/0s and use the IMC as the equipment grounding conductor.
That of course is only OK if the IMC is electrically continuous and job specifications allow a steel EGC.
