You're welcome. And thanks for your patience.
As I've said before, my main purpose in writing scribe was actually to dive into shell scripting, and I've learned a ton along the way. I honestly had no altruistic intent of "helping people", lol. I specifically don't want donations for scribe because then I would feel a deeper sense of obligation than I already do*, and I want to be able to futz with this because I want to, not because I *have* to. Indeed, if this issue had come up in the middle of 2021, my answer may have had to be, "if you have one of those routers, sorry, you're out of luck or you have to fork it", because there was no way I had time then to devote to this.
For this latest issue with routers wanting to write to /jffs my desire to learn more awk drove me away from adamm's solution (even though it currently works perfectly) and actually get the log file location from the syslogd command string. In theory at least, if Asus changed their minds again and put syslog.log yet somewhere else, scribe should be able to handle that. I hope it never comes to testing that theory though.
So, while this is a more complex problem for scribe than other scripts, I did increase the complexity for myself a bit in the pursuit of learning.
* if you just HAVE to give money to someone for scribe, I would appreciate a donation to METAvivor.