Updating to LineageOS 17.1, replacing su with Magisk
I just went through the trouble of solving a similar situation for a OnePlus Nord. Meaning getting root access via Magisk on a LineageOS 17.1 device.

&quot;Will it work if I just grab the latest Magisk zip&quot;?
Yes. I sideloaded it with the LineageOS recovery and after rebooting the system I was able to grant root access to apps using magisk.

Are there any major differences in UX over my current LOS + su setup?
Yes. By installing the magisk zip-file you will get the magisk App which is used for managing your root privileges. I do not have the root option in developer options anymore (as I was used to when using su).


Unfortunately I don't have a bacon here to test your specific case, but maybe my experience will still be helpful.