To make it palatable I finally, after long hours of thinking about this, came up with a positive mechanic:
Why not make all hearthlings level 10 in everything, these are supposed to simluate vikings of a kind which, by definition, are quite daft (you know, they actually believe their gods are sitting on their asses in a mess hall, waiting for them to finally die in battle so they can have dinner together... hahaha, idiots).
Have these jesters follow credos that give them permanent increases in their feeble beliefs about themselves having attributes and abilities like being smart, strong, fast, intelligent, versed at combat (,...) for having convinced themselves fully of yet another imagined creed. Even let them nerve these beliefs through donning fancy clothing with shiny things tacked onto.
Then allow them to buff their beliefs about themselves further, to prior unknown heights, through giving them short moments of bliss from looking at things (LP) and swallowing stuff (FEP), because it would totally make them happy to inflate the believe in their own grandeur even further. Let them dream of their magnificence way brighter and more colorful than everyone thought possible, from exorbitant meals and staring at random shit.
These vikings already believe in that much nonsense, a tiny a bit more won't hurt them. And as it's all just a dream within a dream anyway... it dosn't have to be that realistic, so having their inner beliefs project into their perceived reality shouldn't be much of a problem.
And then come you, jorb and loftar, as you two being lenient and loving game creators you certainly would make these buffs last at full magnitude for (say) 45 days and then slowly fade out over (say) another 45 days. Make them even partly carry over the death of a hearthling to his offspring, as you're not the usual shitty scum developers that punish their players by making buffs last only an hour or two (or at maximum, till death of the character).
This would completely implement the argument being made that mechanic are not allowed to punish the player - which buffs (which are good thing by definition, from being the positive counterpart of the bad debuffs) as suggested can't - as they are... well... buffs.
And we all like buffs, don't we?