While I agree that we may need more hitpoints in the Dwarf form once these changes arrive, I don't think your idea would work.
There are a lot of different playstyles with the Khedlians and being stuck in Tanker form would take a lot of that variety away. They will need to find a way that we can still have a descnet amout of hitpoints in the Dwarf form without negatively affecting the way Khedlians currently are played.
I think the idea of providing more of a boost with the "Dull Pain" power and increasing the amount of healing for the two healing powers would help out a lot. Another possibliy would be to just go with a hit point increase (about the amount that they're taking away from us) to be added to your health when you change forms and to go away when you change into something else (although this could have it's drawbacks as well).