Custom DEM for airports - a properly working solution

I (and many other developers) have nice, pretty, high resolution DEM data for airports available with no workable solution to use them in our scenery. Several of the airports I’m working on are in hilly or mountainous areas with really cool terrain features and sharp drop-offs. As it is, there’s no good way to replicate this anymore.

Any of the methods to use a bunch of rectangles with heightmaps fail in FS2024 because of the hard edges between adjacent rectangles.

Please give us a proper solution to add higher resolution, editable terrain to our airports, preferably one that also allows for runways to follow said terrain.