Replacing my ebrake with a hydraulic ebrake?

Casa The Tracer Main  there is absolutely no easy way to do that. Reason for that is that your MX-5 is not setup for that because NHTSA requires that:

1. Each vehicle shall be equipped with a parking brake system of a friction type with solely mechanical means to retain engagement.
2. The control of the parking brake shall be independent of the service brake control, and may be either a hand or foot control.
3. An indicator shall be activated when the ignition (start) switch is in the ``on (``run) position and the parking brake is applied.
4. If this idea is somehow connected to some “drifting” you may need to check those sites and check things like this video.