Thanks for the advise.
Tonight or tomorrow morning, I will run my automated install script at Github which builds-and-installs piaware and dump1090-fa packages from source code. It has proven successfull on Debian 11 Bullseye amd64 on PC.
Just to have a clean image to start with, before running the automated build-and-install scripts, I will re-image microSD card of RPi Model 2B, using OS image 20210823_raspi_2_bullseye.img.xz