Just a quick note about putting a rear tire on the front:
Take a look at the width of the rim. The front rim will not take a rear tire (not one from the Concours anyway).
Besides that, unless you remove the front fender, you can't go a whole lot wider without changing more things out. Go too wide and it won't fit between the forks.
How long do you need the front tire to last? I normally get around 10-12k on the front tire and 7-8 on the rear (all depends on rider, style of riding, tire compound and such, but that's an average for me). The front tire is $140 and if you bring the bike to them, $40-60 to install. Rear tires are closer to $200 and you can easily get the wheel off and bring it in, so you can get it installed at Cycle Gear for $15 or a dealer for under $40.
I just don't understand what you gain by doing these changes. I remember hearing that the car tire is cheaper. But if you are buying a brand new Concours, for $14k+, does it matter if you spend $100 vs $230 for a tire or if you go through 3 normal tires in the span of one car tire, $100 vs $690?