Hi all, I've spent the past week researching options before getting back to you.
First, clearly lighting has an enormous impact that I haven't fully appreciated. I've been reading and learning a lot. But lighting a small organ loft with even vaguely portable lights seems extremely challenging if not impossible (?). I have been learning about very portable things like https://www.fjwestcott.com/products/flex-cine-bi-color-mat-1-x-1, and less portable things like umbrellas and such, but it remains an immense challenge especially when I'm also trying to position mics properly.
I've been learning about Panasonic BHG1, which is expensive but has Ethernet for power. This would be ideal except that sometimes we have to have cameras on different levels of venues (e.g. a mezzanine for a wide-angle shot)...
I'm considering upgrading to iPhone 15 for my personal phone and at least getting used to log grading with that, trying to work on my lighting skills, etc. For recordings at the end of the month I may rent a Sony FX30 from borrowlenses (no BGH1 there alas) and see how that feels... Will report back.
Meanwhile, if anyone has any advice at all on lighting, or even just how to learn about it, that would be amazing.