NPC Jess Hays in Varanas: choose the 30k donation.
Any old class: you get a Haidon buff (the same as from one from IS auras, e.g. 625656).
As Bard: nothing happens.
Not that important, but just inconvenient: if you want to get the buff from this NPC you need to change class to not-bard first.
(BTW: imo it's not worth investing in any smart fix; for other classes the maching of main class vs buff group is only very general - a magical knight will still get a tanky buff not a magical one etc. So I guess you don't need to match this perfectly for Bard either - most Bards are magical? then give the same kind of buff as for mages)