I solved my I don't want to install uv to build servo, by ripping it out of the servo build scripts and replacing it with clunkier uses of venv.
Also building servo is so much faster & easier than firefox.
On an 11th gen i5-1135G7 @ 2.40GHz with 32 GB ram an a SSD it took 7 minutes 35 seconds to build.
real 7m35.168s
user 40m26.364s
sys 2m44.201s