Besides adapting your driving style, one of the factors that determine brake servo assistance is the diameter of the actual servo. A 330mm servo will have more assistance than a 200mm servo due to the greater surface area of the internal diaphragm.
So one possible solution is to fit a brake servo unit from ether a normally aspirated coupe or from another model like a Rover214, which are generally smaller and thus give less assistance so more brake pedal pressure is required.
You could also play around with brake master cylinder diameters etc, if rules allow.
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