Just to confirm, ESR91 is now being maintained by Jolla and the official version has many improvements over the RPMs I provided earlier. Nevertheless I’ve been using those older RPMs on my Xperia 10 III with 4.6 for a while without problem, so they should still work.
@hschmitt: thanks for the kind words, which are also very motivational! I am planning a second season (102.15 being the next target) but have so far put off thinking too hard about it until at least after FOSDEM this weekend 