I don't think that is a good idea. NFS is more designed for LAN than for WAN.
What would be a good alternative? SSHFS?
It depends on what you want to do with it. WebDAV might be an idea.
You're quite bold - I like it ;-) in all honesty, is your requirement mounting an NFS share? As indicated by @chris it really is designed for the local network.
How about using something more suited like a WebDAV share/mount?
I'd recommend Wireguard over OpenVPN, it's much faster and just generally more efficient. Notably, it also handles network changes better, and reconnects in seconds rather than minutes. It seems like it would be a much better fit for your use case.
I highly advice against nfs mounts between a vps and home network, even with a static ip and over a vpn.
When you need data that's on the nas at home on the vps, it's best to place a copy of that data on the vps local storage. It can act as a backup as well and the original data can be kept safely at home.
What are you trying to do with this setup? Maybe we can find another solution for you.
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