Boeing might want to consider a couple of inspection hatches in the inner lining each side so at least the top two of such critical bolts can be inspected from time to time. And at least every time there is a pressurisation warning. Removing a row of seats and a whole inner panel to even see them seems to much of a palaver to it being done regularly or on just a faraway suspicion.
That would also show that Boeing is doing something physical with the problem that the airlines can assist in. Rather than another procedure in a sometimes shortcoming, flawed and not always followed Boeing quality control system. Boeing seems reluctant to do design fixes on the Max rather than just even more paperwork and training.