Good to read you got through the new brake transplant. The way around drilling out the rear was to mount the front caliper at the rear. Since it has a longer brake bolt. The rear caliper now gets installed as the front unit. It's shorter brake bolt is fastened by two ways:
1. you reach into the fork crown opening and screw on the locknut (and washers if needed).
2. you drill the back of the fork crown to accept a recessed brake nut....then buy an extra long one like those used for carbon forks, to reach the brake bolt. (see squirtdad's post above)

The high cost of this venture was pretty much a given to some of us. We tried to warn you. BTDT, LOL!
It's the price of one's learning curve. Look at it this way, it's like tuition. But at least you can ride and enjoy this tuition.

[hybrid]
Nice Motobecane. For the money, the build quality is satisfactory.
I picked up a Motobecane Vent Noir frame this Summer for myself. If your Cafe Latte is as finished as nicely as mine, you'll enjoy your hybrid.
I'm still piecing together what I need for my Vent Noir. Just found black wheels for its 'black' theme.