Making compostable, non-toxic electronics is hard, so we decided on a harder goal!
Look we already made a robot out of 30% edible parts (hint its not the electronics), if we linearly extrapolate we will have full edible robots in no time.
Also eating search and rescue robots? Because the one thing we need in disaster situations, is for the expensive equipment to be single use.

Noble endeavor with a somewhat unusual pitch.

My mind goes to some post modern civilization where humans hunt self replicating robots for sustenance.