The "V" "^" type you keep referring to is Skid Steer Quick Attach (SSQA). If I was starting from scratch that's what I would build. You'll find a MUCH LARGER variety of attachments that are SSQA compatable.
Try to shop for pictures that give you details. Worry more about strength than weight. Doesn't matter how much it weighs when it breaks. The tabs that hold the FEL pins should be at least 3/8".
Also if you'd take some pictures of your existing system and post them you'll get more ideas of how to modify it to SSQA, or John Deere's method if that's what you prefer. I think they call it "European Style".