Modern competition can have as limited rules as you want, even no rules.
The techniques used in Sanda ARE traditional, though they MAY not ALL be from TCMA in how they are applied.
I don't see any reason why ANY kung fu systems will not work in the ring as long as the person trained for it.
You won't find a much better "testing ground" for your TCMA than in the ring VS a fighter that has trained as much as you, wants to beat you as much as you want to be him.
So why not?
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !