Resource-efficient fork of Mastodon—or go for other Fediverse packages instead?

I'm looking for a customizable, resource-efficient Mastodon fork. Bonfire? Rebased? Or go non-Ruby, like Pleroma (nah), Misskey Calckey, indeed, Lemmy (hui)? Any experiences?

This is part of an endeavour to host w/ a RaspberryPi & solar power. It will be a device to mess around, test, and share experiences.

Potential features:

• tweaking network traffic in various ways
• media options: off, auto compression, auto delete
• monitoring server metrics, energy flow, sharing data through a bot
• auto-off when battery low, sad emoji

Re-posting this from Mastodon w/ minor edits, because Fediverse and potential cross-interaction. I probably should have posted here first and then shared the link on Mastodon, but it's a Mastodon question, so I did it the other way around. Still not sure what's the best way to do this though.