T!Logan might do it if the black heart gets a route where he gives into his sexual desires instead of trying to find love since he might give up on romance if we get it because we were the only person he trusted for a bit and we only wanted sex in his eyes, causing him to become a sort of despairful sex fiend thinking it's his only positive quality?
also Bernard/Player/T!Logan is something we have been praying for since they first got sprites lmao. its definitely possible but just not likely because the difference in personality, being Logan prolly wanting monogamy and Bernard being ok with Polygamy due to him loving you and Caleb.
the Bernard/Player/Gunnar is strangely i think the second most possible of everything for exactly how you described it, purely because i think Bernard might have a more.... possessive route if you submit to his will and let Gunnar take control and tell him how to act, but if you say Bernard is right he might stick to his entire "I'm ok with you messing around long as you come back safe" because Gunnar could prolly easily convince Bernard to change his personality with the right incentive.
and this one, the most possible because its already been mentioned and i think is actively being canonized by Hyao for eventual implementing.
I personally want most of what Wildbara wants but i also want to see more stuff involving Roushk and Rhot, namely a threeway with Rhot calling you a slut and Roushk holding back but either convincing Rhot to hold back a little or giving in and following Rhot's lead. also there is a Threeway i dont think got mentioned in here, the Everett/Player/Feliar, you can screw as a top for Everett while Feliar tops you, Purely top Everett with Feliar or join Everett as bottom and let Feliar be solo top.