I was thinking of attaching it to left side of bucket with some sort of clamp like clamp on forks or a strap to hold it in place and easily removed. sometimes I sits and thinks and sometimes I just sits.
I used a plow share that I picked up from tractor supply pretty cheap. I bolted it to a post on a quick attach plate on my PT425. I used it several years to edge my driveway, cut slits in soil to make straight lines before removing sod, edging ball diamonds, etc... I even put a cable through a hole in the bottom, rear of it and used it to pull a couple hundred feet of waterline 8" under the grass. Works great. However, here's what I'll tell you.... Wether you use a disc or blade, fixed to your loader bucket, you'll end up damaging the edge of your concrete sooner or later. Most likely, you'll make a turn or do something to cause the edger to ride up on the concrete and then it'll take a chunk out. Maybe small, maybe large, but it will happen eventually. You won't do any damage to a dirt or stone drive, but asphalt or conrete, you'll chip it eventually.