> I need a method of keeping data not destined for the 2nd
> microcontroller away from it while addressing the LCD

Steve, how does the 2nd micro know which data is meant for it ?

If you use switches like the 4066, or a bus IC, to disconnect the
2nd micro from the data, it will still have data on its pins, although
presumably that would be fixed with pullups or pulldowns (eg 0000
or 1111), as you shouldn't and wouldn't leave them floating

One other alternative would be to have the data go to both, and the
2nd micro monitors the LCD's EN

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