MRPI working means you *should* be able to reinstall KUAL and have it work. I *think* people have successfully done that, but I have no personal experience with that (my own PW5 is happily sitting in airplane mode at its out-of-box FW

).
Once again, just check the logs.
The ;log stuff should work (barring the usual post-update couple of reboots), but doesn't really help you run KUAL stuff without basically writing a whole lot of boring wrapper scripts. ;log mrpi is a specially crafted shortcut built entirely as a QoL feature to ease some of the insane amount of hoop-jumping involved in the JB process.