wow you actually planned out your gayness....(heheeee). I hope your choice of clubmans was not because they are easy to install because they are not on the wider fours (although joe will disagree with me). Personally if you want low bars I would go with a tomaselli adjustable clubman or clipons but hey...that's just me.
the headshake is probably worn steering head bearings. Do yourself a favor and put a new set of timken bearings in the head - way worth it. Also I would check if your rims are true, an out of shape front rim will also cause head shake. Finally, check your swingarm bushings (put the bike on the center stand and see if you can move the rear wheel side to side).
a dampner is a good idea but it is not a band aid fix for headshake that wasn't designed to be there in the first place. redo your bearings first and then evaluate. If you are going to run a modern non-ribbed front tire then I would consider a dampner, some modern tires on the 750 and 550 chassis can lead to a small high speed wobble.