I do not know if this will cover everything, but I attempted something along the lines of what you are asking and worked out a kind of pipeline. Very briefly, it was:
GlobalMapper:
First, I accessed this course on Gnomon Workshop, which introduced me to GlobalMapper, which is pricey, but you may already have it is you are a professional surveyer. Also, every so often they have a new version that gives you a ten day trial, so you can work with your data there.
The first 5 parts of Volume 1 (I didn;t need the parts about Maya) were particularly helpful in familiarizing me with how to export hi-res geographic LIDAR scans and .LAS into heightmaps and color rasters of selected geography.
I then discovered QuadSpinner Gaea, which was (for me) a simpler and more user friendly competitor to World Machine. A node based tool for visualizing terrain exporting terrain PNGs
This allowed me to visualize the height data, as well as to do other things that may be beyond the scope of what you’re asking, but if you look at the links you’ll get the idea.
Then I did this “Gaea to Unreal” course to understand how Gaea works with Unreal’s landscaping system:
Try looking at those options, and maybe that will help.