Hi friend, of the three solutions i had listed earlier the order i had chosen to enter was with the ease of implementation. Anyways if you prefer to choose the third one... Then listen.

This probably requires a hardware change.
As the ALE pulse is not under our direct control, we have to generate that pulse using some port pin. After that all other signals could be generated using P0( address and data), P2, P3.6 (write strobe), P3.7(read strobe).

The algorithm again could be worked out by referring the ac waveform timing diagrams of your memory device. I must confess i have discontinued working in assembly. I would appreciate anyone reading this might help our friend. And also be known that the to write the firmware the hardware configuration would be required.