site-to-site IPsec VPN only allows 192.168.0.0/24

We established a site-to-site VPN that works, our traffic from 192.168.0.0/24 goes across this VPN to 172.16.24.0/24.

However, remote dial-up IPsec users now need access to this tunnel.

Our remote dial-up IPsec users are using 192.168.1.0/24, and when they attempt to access this tunnel, the remote peer denies it because it is not from 192.168.0.0/24.

How do I make the remote dial-in users 192.168.1.0/24 appear to be from our primary 192.168.0.0/24 network so that it is allowed to go across the VPN?

The VPN provider offers one subnet, I've asked them for a second, they said that's not an option.

Any advice or a point in the right direction would help, thanks you.