About mounting an iso over a network share, ImDisk will obviously work.
Just tested the below with success :
>vmount-win64 attachvhd "\\servername\sharename\iso\win10\install.iso" OpenVirtualDisk OK Flag 5 AttachVirtualDisk OK \\.\CDROM1
Only downside here is that you cannot pass credentials so your share needs to be allowing everyone.
On the plus side, as this is a standalone exe, you can "inject" it with wimboot next to the winpeshl.ini and startup.bat (whereas imdisk would need to be injected upfront thus modifying the iso).