Mysterious Stranger wrote:
Retraining the favored class bonus has some potential for abuse.
We actually went exactly 1 post in before abuse was suggested, given LordKallas suggested using the cost of replacing a HP because you can use it to gain a HP (even though you didn't) and you can also use it to gain a skill point (even though you didn't) and that's more expensive, but somehow THAT cost was skipped over.
In fact under the HP section there is simply the only mention of favoured bonuses and it doesnt allow you to change it, it implies that it is simply part of your new maximum and you adjust accordingly. Its locked in.
So yeah. No mention how, and clearly open for abuse by min maxers...
Answer is no. You're not given the option, so you can't do it.
Skill rank training could be higher or lower than hp training depending on your int stat. If you have an int modifier that is 3+ you could re-assign 3 skill points in 5 days. On the other hand if you have an int mod that is 1 or lower then it takes 15 days to reassign 3 points. It's a fair point that I should have at least mentioned the skill point retraining option but it's potential variable cost didn't seem like a good match for what the OP was trying to do.
I've always taken the presented list as examples of things you can retrain, not an absolute list. If it's an absolute list it means that in addition to a handful of base classes, none of the hybrid classes can retrain class levels or class abilities, since none of them are listed anywhere in the retraining rules. I mean, I assume that slayers can retrain slayer talents and that an arcanists can retrain exploits. As both of these are in line with what's listed for other classes.
Certainly the DM should be wary of potential abuse as always and should disallow something that would be disruptive regardless if it's allowed by the rules or not.