You might be able to get the light fixed for free
go here to explore options and get advice:
there are people there with experience swapping emitters, usually a more modern emitter will end up being brighter than what was in there originally
no, I have not heard of people changing the driver on an HDS, only the LED…
and No, I have never seen an HDS converted to a triple and I do not know anyone that would do that job for you
good luck with your search