Although a feature request from many years ago was the ability to allow keyboard mapping to stack multiple functions ala QuickKeys but withing Media Composer itself without the cost of additional software. In this scenario you stack both functions in the order you want them, “lift+G”.
While one can make assumptions that the next function from a lift is to keep marks in place to edit something else in there, that would just be a replace edit of some kind to start with.
Look into some form of keyboard mapping software for MC and see if it solves this one for you as well as gain other functionality while you’re at it.
Michael