Good news everyone! Seems there may be a viable alternative/replacement for Retrospring after all, thanks to a good friend of mine sending it to me: Neospring! Functionally the same by the looks of it, with extra customizability and filtering possible. Here's my profile: https://neospring.org/@foolsgoldfenrir

Though of course if anyone knows something I don't about it/drawbacks, or has a better choice, do let me know. There's still time before March comes around.