I have got such a hill a mile from my house. Paving is entirely asphalt. I may tape out a couple of 200 meter stretches for testing. They will be separated by several hundred meters. The idea is to ride back and forth, capturing flat-free ride-downhill-uphill-free ride-flat for one measurement cycle, and repeat as energy permits.
I will use an electronic counter and split hairs on the rim readings
No promises at this point.