Swarmkeeper
Hero
There are no heal spells requiring a focus. But yes, depending on the reading, the usage of those things as focuses could imply that you may use them on ay spells. But I think that needs more clarity. And this would make spellcasting a lot less annoying.
I'm not understanding the issue. A spellcasting focus has always been an available option to replace material components of a spell for any class (well, maybe not Rangers, one could argue, but that was fixed with Tasha's).
The special ability of the College of Spirits Bard doesn't invalidate that general rule. The focus just allows the spirits to enhance the healing or damage of spells, regardless of whether the spells require material components or not.