Customize geolocation on Joomla website

I have a Joomla 3.8 website at [login to view URL] that is using the J-BusinessDirectory component to display restaurant locations. Currently the site lets visitors search the locations in two ways: - they can select a state from a drop-down field and see all locations in that state - they can select to see only those locations that are within a 50-mile radius of their current location The J-BusinessDirectory component features a geolocation function, and it is working correctly. However there is a delay in showing the correctly filtered locations. What happens is the site visitor is first shown *all* locations and then (depending on the speed of their internet connection) the full list of locations is filtered to only show those within 50-miles of the visitor. What I need done: (1) I need a pop up created that says "Share you location?". If the visitor answers "Yes" (saved as a browser cookie) then they are taken to the geolocation page. If they say "No" they are simply directed to the search by state page. (2) I need to have the geolocation function customized so that the site visitor is never shown *all* of the locations. Instead a "Please wait while we search for locations in your area" popup displays before showing the visitor the correctly filtered locations. Please see the attached screen grabs for more detail: Screen 1 - Visitors click on "Location" menu item Screen 2 - A popup appears ("Share your location?") If they choose "Yes" then they see Screen 3A ("Please wait...") and then Scren 3B (the geo-filtered locations). If they choose "No" then they go right to Screen 4 (search by state).