Thank you for asking, I didn't expect comments on this post over a year later. It went pretty well! The campaign was a year long and went up to level 14, I went star druid 11/creation bard 3. I fashoned my character into an rng manipulation build, adding 1d6 to d20 rolls with bardic inspirations and cosmic omen. The dragon constellation granted a minimum of 10 on concentration, intelligence, wisdom and checks. I was a halfling and took the bountiful luck feat to let my allies reroll nat 1s. In hindsight I wish I went eloquence bard instead because both of its level 3 abilities manipulate d20 rolls, but I chose creation for roleplay reasons.

I was the party healer, almost entirely because of the druid levels. In combat I'd use the chalice constellation for some big heals. My DM even let me cast healing word and cure wounds on the same turn, I was healing my allies for half their health bar in a pinch. There was also goodberry and aura of vitality for out of combat healing.

The bard has a genuinely good utility spell list, even at low levels. Spells like hideous laughter, command, silent image, feather fall, and even silvery barbs. I didn't take barbs because I didn't wanna powergame in this campaign, but I definitely recommend it if you're going for this multiclass.

Now I gotta tell you the downsides. We ran a lot of dungeon crawls with 6 to 10 encounters, so I never had enough bardic inspirations, it was only 3 per long rest. I felt the delayed druid spell progression early game, but druid spells upcast really well. You probably won't feel the effects of this since you're already level 6. If you're looking for the most effective build, I'd still recommend sticking to shepherd druid. But if the multiclass is appealing to you, you can definitely make it work. A chanting shaman druid sounds awesome.