Instead of dual-booting the Chromebook, the developer mode is enough to allow Gentoo-based Linux to install socat.
Use ESC-Refresh(F2)-Power, then Ctrl-D to set up developer mode of the Chromebook, as so,
Then use Ctrl-Alt-F4 to enter the root account of Gentoo and install development tools with dev_install, as so,
Socat is verified as part of the development tool as the following screenshot.
When installing the Gentoo developer environment, use the highest direct root account login privilege, not the sudo temporary privilege. As the screenshots below show, an access problem occurs within a minute of using sudo privilege.
Either of the 2 options with the problematic sudo command results in no socat installation, and the message after you make a choice, humorously, hints that you will not enjoy the outcome, saying "enjoy it, or not."
TODO: Connect Chromebook Gentoo base Linux's /dev/ttyACM0 to a Crostini Linux docker container running Debian using socat on IP address 100.115.92.1, so that the BLHeli configurator can connect to the pass-through ESCs.
