Additional Auxiliary Hydraulics

I have a Takeuchi TL140. I have a singular auxiliary hydraulic port controlled by switches on the left joystick. I would like to make a custom grader that would require 2 or 3 hydraulic controls. Is there something out there that would be an add on that would give me more ports that I can use via a second control unit? I would like something that has very fine controls since I will be doing final grading of driveways and such. I certainly do not want to spend $10,000 on an actual grader for the skid loader. I can whip up something MUCH cheaper with spare parts laying around. I just don't know how I'm going to do the controls...

Thanks in advance!

Additional Auxiliary Hydraulics