I think this happened to me before.
I've been using KDE Wayland session for a while, but I also switched to
systemd boot for KDE, may be that helped with ssh-agent.
Here are some details:
To enable it:
kwriteconfig5 --file startkderc --group General --key systemdBoot true
Not sure about kick-off issues, I'm using fullscreen Aplication Dashboard,
and it works fine.
Never had issues with typing in Konsole (I have AMD GPU).
If you have some problems with Wayland session - better report bugs, so they
wouldn't get lost. I've reported a bunch in the past, and they were fixed.
Regards,
Shmerl.