Pool Members communication with B-party via F5 VIP

Dear Robinhood,

much appreciate your support and giving time to my issue.

I've added both our servers and B-Party server ip under New Pool, create new VIP and create SNAT(Translate address set to the VIP(there is no source addresses option) as well. but the issue's We've Site to Site VPN with B-Party which is on public ip so we can't reach the B-Party server ip. Will this solution still work?

Please have the scenario we want.