no longer has a valid SSL cert.
LOL, I am so scared to access a text webpage without SSL cert... damn it man, is just text, nothing to worry. Yes, is a bad thing but is not the end of the world for that.
The main dev has decided to halt the project and shut his node down.
Yes, indeed, but, it is FOSS and is already forked and will be maintained. Why don't you fork it anyway? Why complain that the dev is not maintaining it anymore? As I said: his HC node is already replaced by others. SBW can run without his dev or node.