I believe the IDF actually is the only Western power that actually manufactures and uses the RPG-7 for its own forces although I suspect the hardware is identical to the ex Soviet stuff captured from the various Arab armies. The warheads are probably much better than what you can get from Russian, Chinese or other vendors, though.
The idea makes sense if you are passing this out to troops or local allies who can expect to resupply by gathering ammunition from the enemy, don't have the budget or technology to developĀ and deploy advanced weapons (Javelin or Gill/Spike come to mind), or you don't want people to link the explosion back to you (black ops).
For our own use, I would say something like Javelin or Gill/Spike should be the ideal, but unless someone comes up with the money, you could be advocating for crossbows or railguns with the same results......