Dirt Rally 2.0 - No DLC Stages in Challenges

I don't understand how this has gone under the radar for so long.

There are no DLC stages in the Weekly/Monthly multiplayer challenges, which leads to them quickly becoming repetitive given the measly 5 locations available in the base game.

Considering the DR2.0 is 5 years old, I think it's safe to assume most people have bought the track DLC's. Enabling them in the challenges surely wouldn't be such a huge undertaking, right?

The same applies to the single player Historic championship, though the multiplayer challenges would benefit from the inclusion of DLC stages much more.

Long shot, but perhaps someone who is still maintaining Dirt Rally 2.0 could consider adding the DLC stages to the multiplayer roster?