And here is the finished iso: viewtopic.php?t=5095
5.15.4 compiled in Fossapup with kernel-kit(woof-ce). I enabled ext3 support (although I didn't want to). Preemptive, not voluntary. Huge=vmlinuz+fdrv+modules(zdrv):
https://disk.yandex.ru/d/evr4AmkMo9qa_w
Kernel sources: https://disk.yandex.ru/d/4RFZDwQ_HO5nAQ
Ubuntu 22.04 aka Jammy Jellyfish will contain 5.15, so I will hold on to this version for a while.
Ready-to-use iso with classical Fossapup k5.15.4 will probably be posted later.