I know you can setup the RPI 4 to run 100% off of USB.  Once that was setup you could install linux and install Umbrel on top of that.

I am assuming you can do this with  umbrel? 

BlokchainB

I had the exact same issues when I was running the OS off an SD card.  I'd give it another go with booting off a USB -> Sata adapter with an SSD attached.

bitcoin

Low Time Preference Routing Node | Spend and Earn Sats

bshell

I had the exact same issues when I was running the OS off an SD card.  I'd give it another go with booting off a USB -> Sata adapter with an SSD attached.  