I just did that on my Kubota L-35, except that I added new lines and a valve for angling the plow. You might still want the bucket curl function - In fact, I'm not sure how you'd do without it. As to the plow, I bought a used 7 foot Fisher truck plow last spring for $200. I picked up the power for the new front hydraulics by tapping into the power beyond to the hoe. All told, I have the $200 plow, $190 in a quick release plate (local dealer), $120 for an open-center double-acting valve (surpluscenter.com), and about $400 in hydraulic lines, and some minor money in paint, pins and bolts.
Lots of good advice on this forum, which is largely how I figured it out. Good luck!