I used to use synthing in a similar configuration, but my experience is that it can mess up from time to time especially if you try to access the keyvault on two devices at the same time. Still a good way to get a feel for it.
Today I have wireguard set up in my home router which I connect my phone to and keep the password vault on a smb share at home. So anytime I need to access the vault I just activate wireguard on my phone.
I used to use synthing in a similar configuration, but my experience is that it can mess up from time to time especially if you try to access the keyvault on two devices at the same time. Still a good way to get a feel for it.
Today I have wireguard set up in my home router which I connect my phone to and keep the password vault on a smb share at home. So anytime I need to access the vault I just activate wireguard on my phone.