Yes, I am rooted and you can too. You can extract the boot.img from the payload.bin in the crdroid zip, move that to your device, and root normally with magisk. If having issues, I may be able to provide the boot.img from this build later on.
Yes, however I have only tested NikGapps Core Canary so far. Feel free to test others and report your results. The OTA works as far as I can tell for built in updates.
This is the main reason I've stayed on stock rooted with a kernel. Oos cam to aosp hasn't been completed yet. Still a wip. And g-cam is horrid for some reason on the 9 series.
*** Disclaimer I am not responsible for any damage you made to your device You have been warned