Wow awesome idea, and I agree it should be valued in USD as Bitcoin prices are to volatile.
like today, from $95 to $75 in 30min
yep a great time to buy coin at $7 and hold it for the rise
then those redeeming at the now $90 can get a nice amount of bitcoin and u have left overs for busness profit or future customers.
or left as a reserve to counter any more volitility/future purchasing power