Maybe a bit late but I ran into the same problem. Updated my Sesto Senso 2 firmware using the Primaluce Play software (on windows). Works well now on my Stellarmate and Indi drivers.
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Probably best to let it rest indeed until a future update fixes things....I'm no Linux Guru but I don't mind fiddling around with it, which can sometimes have an adverse effect. On a positive note : at least the public key issue was fixed 
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Well, if apt can't get to those headers, neither will the install script from TrendTech. One more thing I fiddled with is the /etc/apt/sources.list.d/raspi.list file in which I think I uncommented the three repos. Could you try uncommenting those, re-run a sudo apt-get update and then try again with the rasberrypi-kernel-headers (or go straight for the TrendTech install process which does the same thing at some point)?
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Hmmm...ok you should try
1- sudo apt-get update
2- sudo apt-get install raspberrypi-kernel-headers
3- run the TrendTech command to install the drivers
If this still fails, maybe there's a repository to point to (I remember I uncommented the "sources" repo in the /etc/apt/sources.list file - using midnight commander and its integrated editor that I had previously installed with sudo apt-get install mc and run with sudo mc. Great little clone of Norton Commander from the good old days of Microsoft DOS ^^ )
BTW after all your updates are you still in 5.10.17 or have you moved up to 5.10.52?
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I had an error that was a bit similar. The TrendTech program was trying to build kernel modules for kernel version 5.10.52 but my Stellarmate was in 5.10.17. Updated the packages (Menu-->System Tools-->Package Updater) and then everything went smoothly.
What's your kernel version? ( uname -r )
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Taking the public keys from the Ubuntu keyserver works.
discuss.freedombox.org/t/solved-buster-b...-raspberry-pi-1b/327
sudo apt-key adv --keyserver
keyserver.ubuntu.com 494
--recv-keys 04EE7237B7D453EC
To be repeated for each of the three key IDs that show up in the error message.
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