it's possible to mount remote raw image?
something like devio 9000 \\.\physicaldrive0 /argument........ on a remote winpe
and use imgmount to mount the raw image?
I don't know if ImgMount handles that, but I use the new command line interface to Arsenal Image Mounter for such things.
on the remote PE/RE/etc:
devio 9000 \\.\physicaldrive0 0
Notice the last 0 to specify the entire drive rather than a partition. Add -r right after devio if you want to mount read-only.
on the client:
aim_ll -a -t proxy -o ip -f ip-address-of-PE
I have used this a few times now myself and it seems to work pretty well.