Can we block international billing addresses and create a regional landing page?

We are using the Geo:Pro Geolocation Redirects app for a similar case.

Only that we have 2 stores in different markets ourselves.

https://apps.shopify.com/easylocation?st_campaign=about-app&st_source=admin&utm_campaign=installed&utm_content=contextual&utm_medium=shopify&utm_source=admin