Hey! First of all: thank you for your interest in running a Snowflake proxy!
If all of your outgoing and incoming traffic is sent through a VPN then it is true that connecting clients will be connecting to your proxy through an IP address in that VPN’s address space. Do you know whether your routing setup makes an exception for P2P traffic?
In general, we would recommend not running a proxy in this kind of network. The IP address space is more likely to be blocked, and the extra hop may adversely affect the connection quality.