Client to see WAN1 IP, all traffic to WAN2.

RouterOS Beginner Basics
1

Client to see WAN1 IP, all traffic to WAN2.

Hi! this is my first time to post and ask. I have been reading discussion for years and managed to solve all my issues. But now I need Help.

WAN1=Direct Internet 50 Mbps only.
WAN2=Broadband Fiber 1Gbps.

I want all Clients to see the our public IP through WAN1. yet all traffic will go through WAN2.

Example when client access Speedtest.net they will see the Public IP of WAN1 but when they press the GO button all traffic will go through WAN2.
is this possible?