All Weather track thought could this work

[jwkniska]

It makes perfect sense..... which unfortunately may be a problem.

The only problem I could see is that you need a different mix of the synthetic based on whether you're running on it in the cold (like AQ would) vs. when you'd take a grass race off after the weather breaks.
If you don't use the correct mix, it balls up in the horse's hooves, making it like running on a skating rink.