I wouldn't refer to it as an MSA, it simply leads to confusing them if they go beyond VFR flying.
I would explain the MSA properly, with reference to flying in cloud and why an MSA would be relevant.
I would then explain how this does not apply to VFR navigation, and how to calculate a "sensible" altitude to fly. (If you love the TLAs you could always call this a "SAF"
)
This would be the 500' above MEF you have quoted, taking high terrain and obstacles in to account. This way, the PPL has a proper understanding of altitude to fly, and doesn't always stick to some stupidly high figure even if it puts you pretty much in cloud when they can perfectly safely fly lower.