QR Rockshox Reba fork for Axle frame?
There's no fundamental reason why not but it would be an unusual combination. Through-axle fork with QR rear is much more common. 

Bear in mind though that there are good reasons why through-axle designs have replaced QRs over the last 5-10 years. It helps make the fork stiffer and it prevents any chance of the front wheel being ejected from the dropouts under disk braking forces. You might also find it harder to find a suitable quality front wheel these days if you're restricted to QR compatible hubs.