HA External Access behind double NAT

Not quite sure where to put this. I own a rental condo that is behind a double NAT. I want to run a script to generate a random code for my zwave lock (I’ve mostly got that sorted out) for new guests - but I need to be able to initiate the script some how. Suggestions on a solution? Setup my Pi to auto VPN to my primary network and access it that way? Can trip through the configuration with some direction but not my forte.

If I can’t easily obtain access to the installation as a whole - is it safe to use something like telegram to initiate the code generation and retrieve the result?

Thanks

If you have a computer there, you can do Google’s Chrome Remote Desktop and access it that way. There is Dataplicity
https://www.dataplicity.com/ Both of these should work through a double NAT

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Use mqtt messaging and remote mqtt server