EbonJaeger
I have my OS back (didn't try restart yet...)
Just installing element (and other software...) takes time so saying.
While I thought it didn't work, it did.
It took times, the command (or the other) from chroot took place after a while on login to desktop and solved it.
I don't know will exit from keyboard applet just in case.
P.S.
As EbonJaeger says, remove the language indicator from the panel itself on this stage 🙂
Worked (done that next restart) 🙂
It may take time/be a bit quirky (sound temp issue?), but it helped me and other one and I hope for others too! You said it's a workaround, so thank you very much, and good luck 🙂 I have sound working too, yes.