Couple ideas:

Make Luke a dead Force ghost from the beginning and minimize his role in the story. Imply that he died somehow or that he ascended to a higher plane. Make the plot of The Force Awakens about finding something else. Make Rey someone that Luke already trained, which explains why she starts so powerful. Maybe start the story with her training. Obviously this would require cutting out huge chunks of all three movies. Personally I would prefer to cut out almost everything in TLJ in regard to Luke, but that’s another topic and you wouldn’t necessarily have to to implement this idea.

Maybe instead of a map to Luke, TFA is about a map to the fleet of star destroyers (similar to the Katana fleet in the Thrawn trilogy.) Maybe the map is destroyed and Kylo gets the wayfinders as an alternative without the good guys knowing, where he meets Palpatine and finds out he’s got the fleet.