Thanks for the links Duncaj.
I have no doubt that some combination of those offerings might do the job. However, important details like dimensions etc. are very lacking on the Tower site. Also, I have a solution that will not involve weeks of waiting for international postal orders. Explained and detailed by BogBeagle above.
I think the square drive solution for cordless power drill is superior to all of them actually. (without having any experience of any options, that is).