Replaced bitcoind binary in Umbrel

Is there a way to replace the bitcoind binary inside umbrel? I am trying to get my umbrel install on Ubuntu to run a fork of core to interact with the UDP packets of bitcoin data from space delivered to my entire home network from my satellite dishes (thank you Blockstream lizards!). It runs exactly like Core but has a few more bells and whistles.

Alternatively, I can run a separate bitcoind for the blockstream satellite connection on my machine and just prune it…but I don’t want to duplicate stuff…

is it impossible to replace the bitcoind binary inside umbrel? Can I somehow put in a symbolic link? How do I introduce files inside the container?

I don’t get this docker stuff…it’s so hard to interact with bitcoind/lnd at the commandline when I run stuff inside umbrel. But it’s such a PITA to get stuff to run outside umbrel (try mempool on your own, for example). Ugh…