yes. you can go ahead and use latest magisk 7.4 will be fine. (on 1908.12) after unlock bootloader, flashing root boot img, installing latest magisk and root explorer to change fingerprint, go to the thread i linked to and update to latest 1910.35 with the zip provided, then go to the other thread and continue with unrooting and re-locking bootloader, if that's what you want...
OR
that method seems ridiculous... and long-winded.
1. you'll have to wipe the data and factory reset any way
2. so why don't you just use
this guide from step 0) - step 8) then the following steps 1 - 3 to unroot and relock bootloader...
this seems like a much more simple solution for you...