Only one pointer to make and that is contact resistance. You will find a temperature rise at the wiping connections which will be transferred into the Hawkers which will complain! I remember using a solid copper link between two Hawkers once which very slightly worked loose - the M5 bolts still were too tight to undo with your fingers. This contact resistance caused the copper to heat up, the Hawker case to melt and one cell to fail.

So unless you can guarantee a very low contact resistance (remembering greasy fingers on the key causing tarnishing etc.) that does not worsen in service, I would look for another solution.

Paul