Instead of having to pay a massive gold amount to the Oathbreaker Knight so you can respec with Withers, give the character a permanent effect (like hag-eye) that immediatly re-breaks your Oath when you leave the Withers' class change screen.
Could also replace the line that Withers saying that you need to mend your oath to "Know that this will not mend your broken promises." or something like that

Why?
Because I am multiclassing Paladin Bard and had to fork over a lot of money just to get my bard fixed after the update.
Would also make playing Oathbreaker feel less restrictive (i.g. you found Club of Hill Giant Strength and want to respec to put your STR points on CON, now that the Club is fixed)