3D Mesh from drone survey of Industrial Site

Good day, please could I get some advise on how to import and publish a very large mesh with Unity. I have mesh files ranging from 12 GB to 24GB from industrial sites in both FBX and OBJ formats divided into hundreds of smaller tiles. I import them with Pixyz - is there any other way? But I cannot publish the build because Unity is capped at 4GB for asset. Would really appreciate some guidance and workflows from the pro’s. I see these amazing massive mesh worlds in Unity videos but cannot figure out how to do the same with these large industrial mesh files?

there is some update starting from 2021.1
Bug: 4GB limit to Textures in standalone build page-5#post-5300130

other possible workarounds in this thread
(asset bundles, split to multiple scenes…)

Thank you mgear.