Didn't Yoshi mention at one of the fanfests that they are planning to impliment something in ShB that'll help mitigate item clutter for Fsh? Doubt it'll be tacklebox since if it was something like that I'm sure he'd mention it specifically to hype expac even more.

Only thing I can think of is turning bait/lures into consumable items that unlock them for fsh then having a separate skill window to select which bait/lure you want to use?