We had a quick discussion and the issue is:
Even by locking to the summer season, there wouldn't be a better match comparing to now, because our summer texture is really different from the one from Swiss Pro, their colors are far too bright.
So, we decided to create a separate official compatibility pack for Swiss Pro, that will feature a background expecially processed to match as closely as possible Swiss Pro colours, and with scenery locked to a single season, all with a proper installer.
Will be available very soon, together with other small fixes to the scenery we are doing (like a problem with rwy 14 DME)