nevermind, i was able to install 10 pro on Surface pro x, i mean clean install, even newest builds after upgrading drivers
you have to export drivers from recovery image, then integrate them with boot.wim and install.wim in 18363 iso from uup.rg-adguard.net (dism might be helpful), and overwrite file bootmgr and folders boot and efi from recovery image. then when you install build after joining dev channel, drivers will upgrade. they are in folder called filerepository in c:\windows\system32\driverstore. copy only these drivers which are in recovery image. then when you own upgraded drivers, you can download last dev build from uup.rg-adguard.net, integrate drivers again and clean install