[Aerich]

I think so. The key is high level spells, particularly the druid summons. According to the spell progression table in my manual (the IWD2 manual is, of course, renowned for its inaccuracies, so I make no representations that these numbers are accurate), a lvl 19 druid has 5 spell slots for spell lvls 1-5, 4 for lvls 6 & 7, and 3 for lvls 8 & 9. A level 20 druid has 4 slots for lvls 8 & 9. There's no change after that to access to spell lvls 7-9 until druid lvl 23.

To recap, a lvl 19 druid will go 4/3/3 for spell levels 7/8/9. The druid class tops out at 5/5/5 at lvl 26.

What level progression will you take with the bard/druid? Are you going to go bard[11] first? If so, your druid might be lvl 6 at best heading into HoF, meaning that it will have to be carried by the rest of the party for a while until you can add a few more druid levels.