this has been a test, and it works with the tools I've listed. I can't follow an overkill.
Selected with FS Grid Level 16, displayed in Google, and generated the six individual tiles with FSET at -2 resolution.
The result are 6 BMP files with 22 MB each.
I have revised these BMP files to make the presentation of the runway and taxiways clearer. The whole thing was created with Level 15 High Detail in Geoconvert.
Then I removed the files rap546m26m_decal.ttx and other decal files in my FScloud Scenery.
The result is what you see here.
And there's no problem whatsover with the approach. Even with the files of the main scenery Germany in level 9-12 not.
9-12 is enough for VFR flight, for the airports I use level 15.
For crossed Runways i make the same things, see Picture from EDXW....
No bleeding effect or what ever....
Important: this only works with airports with a relatively smooth surface. EDDK even works because the runways lie at a different height than the taxiways.
The Aircraft crash when you drive outside from Runway.
This is not a must with Grid 16, it also works with 15, because Google or who else does not give a better resolution.
It reaches level 15 and resolution max. -1 in FSET.