Only the first one is isekai I'm sorry
https://www.mangago.zone/read-manga/the_affairs_of_the_other_world_depend_on_the_corporate_slave/ (this is isekai)
https://www.mangago.zone/read-manga/king_s_maker/
https://www.mangago.zone/read-manga/eternal_covenant/
https://www.mangago.zone/read-manga/draig_mid_knight/
first ones that came to mind cause of the art
https://www.mangago.zone/read-manga/antidote_harusari/
https://www.mangago.zone/read-manga/regas/ (shounen ai)
Not isekai, but stigmata is religiously themed medival BL. It does have some similarities with isekai though. The plot is above average for BL IMO (=・ω・=)
https://www.mangago.zone/read-manga/stigmata_1/
Thank you guys, much love
Really, I’m mostly looking at medieval art style + BL, so the isekai part isn’t too much of my concern lol