You can simplify a lot of this using wireguard between the server and your full node. You can host lnbits on the server and point it at your node via the wg ip. No port opening, no home IP address needed.
How are other external users going to connect to your LNbits then for resolving the Lightning address etc?
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I assume he meant using tailscale to connect your node and your external VPS running LNBits.
Correct. No poking holes in network appliances. Just use tailscale for nat traversal and to mitigate dynamic home IP problems.