Below are some pictures of my latest king pin design before wiring.

wearable keyboard, palm side in hand

Figure 1.  This wearable keyboard design uses pieces of coat hanger wire to support the keys.  The keys' positions are all adjustable.
top view 
Figure 2.  Top view.  The fingers happen to be touching the keys here but that is optional --- the fingers play no role in retaining the keyboard within the hand.  The frame contacts the hand at the curved back brace, the thumb joint, the heel of the hand and the base of the little finger; this is sufficient to rigidly support the keys.
Figure 3.  Back view. 
switch on wire

Figure 4.  Switch arms.