I also like Netbird, I have a server running on a non-Cloudron VPS, connecting devices to each other when needed, and making an in-house box available to selected people in external organisations.
"Netbird on Cloudron" can mean :
use an app on Cloudron to act as 'server'
install the Netbird client at Cloudron VPS command line (not an app - outside of Cloudron platform), so Cloudron box is on the Netbird network, but no Cloudron app needed. I'd tend towards this if it viable, but my network routing knowledge is poor.
Are peeps here thinking about it a different way ?