Front racks can be mounted to a fork without eyelets by using P-clamps around the lower fork legs. However, this is a bit of a jury-rig and the weight you carry on it should be limited.
I don't think 25 pounds, evenly distributed and kept low on a rear rack, will upset your bikes handling. Last summer I credit-card toured with three friends and we were all on sports-type road bikes with only rear racks. I had about 15 pounds of luggage in small panniers and a rack-top duffel. The other three guys in my group carried as much as 25 pounds (one guy brought a guitar!). None of us had any handling or stability problems and we were in hilly country with daily 40+ mph descents.