Imagine I’m only wanting to try this out. I want to be able to send 100 sats from one lightning wallet on umbrel (the node) to a wallet on my phone. And I want to send 10 sats to a wallet on my lnbits on the umbrel.
Just playing around to test the system. Get educated about how this thing called Be your own bank works. (...)
I want to teach them this lightning thing and running your own node. I simply cannot ger this up and running. Because when I tell them they got to buy a raspberry pi of 200 us dollars, an ssd card of 300 dollars

Just buy Optiplex $85:
https://www.amazon.com/Dell-Optiplex-Business-Certified-Refurbished/dp/B07DR68B65
swap SSD for 1TB $38:
https://www.amazon.com/Patriot-P210-SATA-1TB-Inch/dp/B087KBL5KS

1. install CLN on it
2. set Breez Wallet on your mobile phone
3. make small private channel between both nodes

This way you will be able to play with two different implementation at once (CLN and LND on Breez), with command line available also on your smartphone (!)

Cheap and perfect setup for educational purpose.