ABS and brake booster delete

Hi,
I'm considering removing the ABS and brake booster from my rally car.
I came across someone on Facebook selling adapters to eliminate the brake booster while still using the original master cylinder and brake pump.

Has anyone here tried this modification? How well does it work?
I've heard some opinions about the brake pedal feeling too hard with the standard brake pump, and some suggest switching to a custom one.

Appreciate any response, thanks!