I haven’t tried anything like that personally, but I don’t think speeds should be affected that much. Latency should be the main problem.
I assume you are using a VPN; So which one are you using?
As far as I know there is absolutely nothing you can personally do on the WAN side of networking (at least on a normal home connection).
You can’t use static routes in the way you’re likely thinking.
You can only set up a static route for one hop away. So, static routes don’t work over the internet, because there are a lot of routers (hops) in between the two home routers.
If you had a really long fiber cable that stretches all the way to your home in Asia it would work.
What you could do is set up a faster VPN like Wireguard and look for any bottlenecks or issues in either network.