I think it's a great idea. And not just for match shooters... a very good way to practice / hone 'standing rifle' techniques at home.
I could imagine using some classic / collectable smaller airguns, like a BSA Cadet, Meteor, or a HW25 or 30... all in .177 of course.
If it catches on, Bob - Might you put on a .22 Rifle 6 yard MPL comp in the future... ?
Do the rifle targets come in 'regular' 7 inch size? are they single bull or 5 bull?
Oh, and anybody using a powerful springer / SSP would need a strong target holder / pellet catcher... the cheaper 'funnel type' ones get ripped apart by 10 - 12 FPE rifles within just a few shots, even at 20-odd yards.
ATB - Phil