Well, first such a device is needed.
And I guess the cost a little bit.
And once done the prank would be known. You could only do it once.
Second - it is too obvious for what it is made. Only stocks on a flat bench you perhaps could explain as to hold the feet for a massage - but being strapped to get a Massage - no way!
Third - set you really manage to get your victim trapped.
That would be very evil.
Look at Canelli at Bouliac: They may Trick or force people into the predicament, but they are not restrained that they really can't move any more.