Ok soooo I'm brainstorming a new au for your soulmate universe... what if in Dunk time travel from summerhall....
Instead of Dunk seeking his soulmates back, he flee from Ashford meadow, like straight up gone (maybe there's some magical helping hands of both Shiera and Bryden cause they feel kinda guilty or something) with all his horses and armouries. It's like he's never been there physically, infact never existed, the only prove they have is multiple eyewitness and soulmarks. With his former life knowledge still remember, he began life anew.
(maybe.... They also help Dunk in barricade his bond with Egg and all the other soulmate he had, so his connection with them are even more hard to placate)
Then after that's there's mysterious Robin Hood-esque tales in Westeros, of a giant spectre Knight that hunt the bandits, distribute wealth to the poor and protect the innocent (I know its kinda sound out of things for Dunk to robe the nobles but there's possibility cause yknow his mind kinda fractured from the bond sickness). So the noble houses of Westeros is forced to investigate this tales that grown among the Smallfolk, cue the royal family involvement.
The life Wayward!Dunk has adopted is what the nobels call honourless, lowlife and such, but he's actually happy. Seeing the smile of a milkmaid, shouts of thanks from the orphans, helping an old kind man by plowing his land, and cries of newborn babe Dunk had helped to guard. It fulfill the emptiness of his heart, and the lacks of soul bonds he have now, mayhaps he may die more younger and honourless that he previously do, but it's what True Knight should do.
Except... A rumour has spread too, the royal house of Targaryen and storm lord Baratheon (new branch of Fossoway on the side have been producing the best Cider of the entire kingdom so far, it's a shame if no one win the free for life coupon life) have band together over someoneâ a hedge knight?
As their retinue wreck questions upon questions about a certain hedge knight, someone so tall with sunset, elm tree and falling star on his shield. Sandy blond and eyes as blue as Tarth's sea, his body strong yet gentle in heart... No Smallfolk rattle who's their Wayward Knight is, no one, not even Robins upon trees would chirp to reveal his location. Whom? They exclaimed, Tall like a tree? Aye must be a dream! They laugh in the face of royal searchers.
And Dunk will knew, when hes finally captured in a poor fate, his blue eyes will meet the gaze of his lingering â some never exist even â soulbounds. When he do so, he will realise, those eyes are too heavy with grief, longing and all-knowing in little Eâ Prince Aegon's eyes...
Especially cos in his mind well it must have been him going to Ashford that made everything go wrong. So now he's more skilled he can just spend his life being an amazing hedge knight for the small folk. And he does this for a couple of years.
Completely unaware of the loony tunes cat & mouse game he's involved in the whole time with the Targaryens, Baratheons, & Fossoways.
Who are all frantically looking for their soulmate.
With Brynden & Shiera I think they sometimes pop in to say hi to Dunk, & without him knowing make it harder for the others to find him. Dunk knows they don't really remember tho, just that their powers/sorcery make it so they get glimpses of the other timeline. But he's happy they visit.
It's not until faced with a very angry Egg - who in revenge for the delay puts his soulmark on Dunk's forhead - that he realises his soulmates also remember.
Maekar & Baelor are so mad. Specifically for Baelor that's HIS knight who swore himself to him after the trial & now he's gone with no trace.
A lot of them wonder for a while if they're trapped in a timeline where Dunk never existed.