Anbox is no longer maintained, as shown on Anbox · GitHub. It does appear to be absent from the repositories of Debian 12 and 13 (which the existing Kicksecure 17 and future Kicksecure 18 are based on, respectively).
Kicksecure 18 will use Wayland, which means it will most likely work with Waydroid. In the mean time, it may be possible to get Waydroid to work on Kicksecure 17 by using a windowed Wayland compositor such as Weston, however this is undocumented and last time I did it, it was very tricky to get working.