Not possible with the current script.
The View Larger Map link takes the GC code as its parameter, however the Browse Map page does not support GC codes, only long/lat. Someone with java script experience would need to re-write the script to extract the coordinates from the cache, convert them to dd.dddd format and replace that link. And then someone else will prefer the old map, so an option to save preferences would also be needed.
Given that all this does is save one click, I would guess this would be a very low priority.