I don't think there is a specific PV-based method. But that's also probably because you'd have to convert their effects over to Alpha Strike as well.
What I might recommend, though, is at least try this for the Artillery Support:
- Determine the type of artillery you want to use (Long Tom, Sniper, or Thumper)
- Since a unit with the appropriate ARTX ability gets (damage x4) PV points, that could work as the PV "cost" for that particular type of
Same thing with minefields: Light, Medium, & Heavy Density minefields as BSP correspond to minefield densities of 1, 2, & 3 each in Alpha Strike, & the MDS# ability gives 1 PV per #, so that could be the PV cost there.
Defensive Air Cover is pretty easy, I'd just leave it at 1 PV to purchase (but you have to have the right type of air cover).
Offensive Air Cover is going to be tricky. The quick & dirty way I'd say is treat it like an Artillery Strike (Alpha Strike damage is 1 point per "damage grouping" listed by type), & the PV cost is the damage x2.