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A bit late to the party but yes, it's possible, no changes needed to the hypervisor. I forwarded the PCIe device of an RTX3090 (and one of the USB controllers for keyboard&mouse) to a windows VM and installed the latest nVidia driver (466.11) and the screen started working.

For PCIe passthrough: https://xcp-ng.org/docs/compute.html

Copy on write is the default way to work when you create a snapshot or a new VM in fast clone.

Disk space used is not related to copy on write, but thin vs thick SR type. It's documented here: https://xcp-ng.org/docs/storage.html#storage-types

https://xcp-ng.org/docs/guests.html

Have you given this a read?

It says that you shouldn't be mixing the Citrix drivers with xcp-ng. It's also stressing the importance of not running the windows update until the guest tools are installed.