I think if I'm in a situation where I need to carry a rifle around for its extra firepower and range, the circumstances are probably such that keeping a low profile is no longer possible. And I think that under such circumstances, any firearm that's displayed would draw attention whether it was of military styling or not. In such a situation, is a concealed AK with the stock folded or AR Carbine with the stock collapsed (or even broken into halves) a better choice than a "hunting rifle" that's openly carried? Who knows... it's a decision each person has to make for themself.
Since you asked who'd pay for the rifle you describe, I have to say I wouldn't. I just don't see what it could do for me that any number of existing rifles couldn't do as well or better. Sorry PFletch83, but haven't convinced me yet.
Having said that, if you're all about this get in contact with some gunsmiths and see what can be done. I'd likely avoid Remington 700's because I've read reports that the bolt handles, which are silver soldered on, can break off. If I were trying to accomplish this, I might want to start with the CZ-527, but I don't know if the feed system could be adapted to AR type magazines.
The Ruger 77 starts off as a CRF Mauser style action in .223 but I'm not sure if they could be altered either. But if you can get the magazine lips in place and get a latch set up to hold it there, I'd think you could get it to feed.
If you can live with a pump action you could look for a Remington 7615, which is basically a pump action 7600 already adapted to use AR magazines. I think they have ghost right sights already attached as well. There are a LOT of Remington pump actions used here in the east as hunting rifles and even chambering full power rounds, they tend to be pretty quick and very reliable. I never hear complaints about them.