For LOWI (Innsbruck) I found a WorkAround (instructions for action at your own risk):
paste the ORBX folder "Innsbruck" from the ORBX directory "places" into the user directory and rename it:
/Users/username/Library/Application Support/Aerofly FS 4/scenery/airports/eu/at/lowi__innsbruck__orbx
rename the ORBX file "innsbruck.tsc" to "lowi.tsc
duplicate the renamed file "lowi.tsc" to "lowi.wad".
=> That's it.
Only a small hint for the last resp. 3rd step of your tutorial:
It is better to create a copy of IPACS original WAD file from scenery/airport/ directory instead of renaming the copy of TSC file.
This way the runway will be displayed correctly on the map and the runway start positions will also work. It also works properly for ORBX LSGK Saanen.
Otherwise your temporary workaround works very well, many thanks!
Comment: Still waiting for progress from IPACS with their new Airport Designer and at least first information/specifications for developers, this regardless of the completion of their tool and especially regarding the cultivation with buildings. "Don't break our simulator" means that we should get informations. Otherwise, we can not be criticized/blamed for what we are doing here.