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Waydroid does not require linux-zen. It requires a kernel with the binder kernel modules. They can be managed with dkms on a normal kernel.

...or just included in the "normal kernel", as binder is mainline.

Last time I tried it needed things in binder that weren't merged yet, is that fixed?

I've been using it for a few years and it never required any kernel patches. If it doesn't work in some distro, it's because of its kernel config.