I think you would only be exempt if it was converted to electric and re-classified as such, I bet you could get it done for maybe 20k
We have to travel to the QE quite often and normally use the M6, Aston Expressway then A38 through the underpass, from now on I will sit with everyone else on the ring road or go down the M5 to the A38 and back up to the hospital.
All these LEZ's are simply keeping me out of anywhere that applies them.
I feel sorry for the people living in the catchment areas who have or will have to change their cars because of some greed tax.