I have this one. Scald at 160 degrees for 15 seconds, then 30 seconds in the plucker gives you fully plucked birds.Can you recommend a plucker?
https://coopsnmore.com/products/rite-farm-products-small-pro-plucker-quail-plucker
Edit: You can pluck 4 or 5 birds at once in 30 seconds.