its not sparring, it is conditioning a part of your body (forearm though-elbow was born conditioned), it is a partner drill, start a pattern slowly or elbow meets face, move around during drill this isnt static.
Basically you will create this between yourself and others so ideas are fresh. Its just like sinuwali (sp?) stick drills, elbow to elbow while varying foot and rotation direction, vary striking low crouch to erect short stance (e.g. your Rt 45 downward meets partners Lt 45 upward, etc, downward vert meets forearms together fists facing), even lightly this will hurt and post practice treatment as Iron Palm Hot/Cold alternate immersion followed by Jow (dont spend a fortune use tiger Balm) why? Lg Intestine channel runs down biceps to forearms and fingers, avoid damage to meridians if possible by post treatment. avoid exceeding med force after conditioned, bones still break and while the great vessels of the arms are interior, nerve and lymphatic damage is possible and bad, blood clot bad. That is the best idea I have to satisfy your desire...Body conditioning w/ impact near large blood vessels and nerves et al is dangerous but if you like this idea...dont use pads, pain is a signal, lets you know you are alive...be careful
do not try to spork the post, for that is impossible, only realize there is no post to spork