I highly doubt you'd need a "new head" from that sort of damage. i have done about 5 of these from timing belt snapping. its always the same case. new valves. and move on. never had to replace the head itself.
i also never remove the "hub" from the camshaft. i have found no need to do so. i always just replace the seal behind the hub from the back. sneak it in. place the camshaft in place in the lower part of the head WITH the seal already in in place and then just carefully bolt down the top part and never had the need to detach the VVT hub from the camshaft itself.
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