Would it be possible to buy the blackToe, and the 4th Axis, then build your own Tslot table to attach both items to? Would a setup like this be possible?

Buying both the blackToe and the 4th axis is an available option, but take into account the clearance available on the gantry. The best option for the table will be a adjustable mid-section table. That will be able to lower when the 4th axis is going to be used. Or have a elongated table that has a portion for the basic CNC, then a section for the 4th axis.