I posted about OpenWISP a while back but I need to report that it is buggy and unpolished. The community behind it also is very small so not much happens.
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Use Netbox templates instead maybe?
https://docs.netbox.dev/en/stable/features/configuration-rendering/
Thanks for reporting back. Every time I looked at it’s features, I came to roughly the same conclusions. Glad you actually did the work to try it, though.