I've thought of a simple workaround to the problem myself (although not ideal), have a changeover switch that has the common as the pic pin and the changeover contacts as 0v and +v.
But then that is THREE wires and you specified two a couple of posts ago. But yes, that'll work providing your switch is the break-before-make type otherwise you'll be shorting out your +5v line.

I am simply asking if it is possible to get an active high input on a pin ? using any method whatsoever without the need for an external pull-down resistor?.
Without external components, your simple answer is NO.