Cant you get the same range of motion with some surgcial tubeing and a fixed object like a tblae or bench? That is what the PT had me using after I blew my ankle out. Cycling and swiming with kick fins will also make you ankles stronger. They also get you out of the gym for a while.
"Gently stretch your Achilles if you have medial shin splints, and your calves if you have anterior shin splints. Also, try this stretch for your shins: Kneel on a carpeted floor, legs and feet together and toes pointed directly back. Then slowly sit back onto your calves and heels, pushing your ankles into the floor until you feel tension in the muscles of your shin. Hold for 10 to 12 seconds, relax and repeat.
In a sitting position, trace the alphabet on the floor with your toes. Do this with each leg. Or alternate walking on your heels for 30 seconds with 30 seconds of regular walking. Repeat four times. These exercises are good for both recovery and prevention. Try to do them three times a day. "