A simpler alternative to OOM daemons could be enabling MGLRU's thrashing prevention: https://www.kernel.org/doc/html/next/admin-guide/mm/multigen...

I'm using it together with zram sized to 200% RAM size on a low RAM phone with no disk swap (plus some tuning like the mentioned clustering knob) and it works pretty well if you don't mind some otherwise preventable kills, but I will happily switch to diskless zswap once it's ready.