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Waydroid in this tutorial is running in a “cage” so it can run under X11 which is an older system used by the current KDE version in the steamdeck.
To install it on bazzite (under Wayland instead of X11), it’s even simpler.
rpm-ostree install waydroid
and
sudo dnf install waydroid
So if you are ussing bazzite, follow first option here
I just lend my steam deck to my girlfriend and she games around, your aproach is 100% valid
Valve released a console, and you can use it as you wish, if you want help with installing wayland let me know, or you can search for any other tutorial online
Have fun gaming :)