I previously used Mailbox Alert, the developer of which says is not likely to be updated to 115, to call TerminalNotifier https://github.com/julienXX/terminal-notifier on my Mac. Actually I had Mailbox Alert call a bash script, which read the parameters sent by Mailbox Alert and formatted them for TerminalNotifier. I think I can write a bridge that will take Scriptable Nofications's JSON and transform it for the same use.
One thing is missing though: Mailbox Alert sent a TB Message URI, which meant I was able to make TerminalNotifier's notifications clickable... clicking an OS notification would directly open the message in Thunderbird, no muss, no fuss. I don't know anything about the under-the-hood changes in 115, but, do message URIs still exist, and would they be an easy bit of info to include in the JSON?
Perhaps someone might find Folder URIs of use, too.