Reclaiming a holy site

[Beowulf]

So i'm well on my way to reforming the Hellenic religion, currently i'm in striking distence of both Rome and Lentini and hopefully on capturing those two regions I should be able to have enough authority, only problem is the holy site of Eddesa is only partially under my control.
https://steamcommunity.com/sharedfiles/filedetails/?id=1829339927
A bit of a oversight on my part since I did not think giving my Slavic Brother the land would be a issue but now he has replaced the Hellenic temple holder I had with a Slavic priest. So I need to either convert my family member or remove him from power to replace with a Hellenic and for whatever reason I can't plot to revoke a title, any suggestions on how to quickly solve this problem?

[Rodi]

title revoke the title of the priest and then give it to a hellenic one.

if it doesn't work you can try to prolestize that province(which may convert the priest), kill your bro or have chancellor fabricate a claim on it and then revoke without tyranny.

[Wokelander]

If you have religious revocation AND the county holder is your direct vassal you can revoke the county title, then the temple. Other than that, any sort of method that allows you to revoke titles will work (claims), but you'll have to be the direct liege of the temple holding to revoke it regardless.
It may be easier to just swallow the tyranny hit, especially if your current character is getting on in years