In most areas it is incredibly easy to take over a BPOU. Get a few friends, go to the meetings, vote yourselves in control and take over the BPOU. Work your way up from there. If conservatives really do have the numbers and put out the effort, the squishy elites cannot remain in control.
That may be the case at the local level. But I think trying to unseat GOP RINOs at the national level is a different animal.
You are not taking into account that the GOP has been coopted by the demrats. They will not permit conservatives to displace RINOs. Surely the fiasco in NY’s Dist. 23, where the RINOs ran a former demrat, should open your eyes to reality.