First of all - you will never get equivalency between brushed and brushless motors. Even a brushless motor that has a similar amount of power delivers that power in a different way and a lot more consistently.
Secondly - although the ESCs in "blinky" mode are equal, the motors are not. There is no requirement (at present) for locked timing in the motors, so the motors with a larger amount of built-in advance will perform better in "blinky" class (not much in it, but enough to make the moneybags racers seek out the fastest "stock" motor).
It might be worth choosing a "spec" motor for everyone since your club hasn't gone brushless yet. You can let people keep use their old ESCs in "blinky" mode, there will be no advantage to any particular model.
Even if you have an open motor I suspect that the motor choices will even out quite quickly. Someone will turn up with a certain motor and be fast, then everyone will copy them!
13.5 blinky should be fairly close to your 23T brushed.
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