BOAC:
Begging pardons for thread drift here, but how could I ascertain that MVA is 4000 on V264 from that chart?
Unlike most ICAO-compliant member states, the FAA refuses to provide MVA charts to pilots. So, you have to take it on faith that ATC is not giving you a bad altitude.
What sort of clearance would you get if descended to 4000'? It could not be on the airway. I would shoot for a requirement for a clearance "maintain the 073 radial route POM cleared to POM" (or words to that effect) at 4000ft (with an MEA of 6000) and since POM is an IAF I would have thought you would then be OK for the approach?
A clearance at 4,000 via the 073 radial or simply direct would be acceptable. And, once you arrive at POM the IAF is for purposes of the course reversal. Note that PRADO fix and PDZ VOR are also IAFs, but with NoPT annotated on the route between them at POM.