I have started that project myself. I wish there was an efficient way to process through my followers. Like a Profile Explorer. As it is, once I've made a change I have to start at the top again. Surely leaving some trolls safely near the bottom.

I also want to prune dead profiles.

yeah, its more necessary with nostr. although i wish there was a "mute" feature. follows also dictate who can dm you, and also the reach of you cli as it discovers relays in your contact list, etc.