No,If you use port 0 and port 2 as the multiplexed data and address lines then you cannot then deside that they are general I/O as well they are one or the other.
But what you can do is define an area in your memory map as an input or output port and arrange the memory select logic so that if it sees that address then it doesnot read select the memory but an I/O buffer.
Its called memory mapped addressing.