The easiest way would be to install a proper 4 point cage fitted, as stated not wise without a cage, and have the mount point as part of the cage, keep in mind 4 point cages are legal for road use and most good companies give an engineers certification in case you need it.
All harnesses are removable anyway so you could fit it when you need it only on the track and therefore negate any need to have it engineered for street use as you will remove it before heading back out on the street.
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