Setting Speed Factor for PX4 SITL

What I want to achieve

I want to run the PX4 SITL with a speed factor like 5x or 20x. How can I achieve this?

MAVSDK

This is supported in MAVSDK tests:

And it would be very nice to use it for regular PX4 SITLs!

Other

Another Discuss topic that was unanswered, which asks the same question: