Removing chips from MICROTEAM don't change anything, the databus still drived (74xx245) when reading from MT address area.
There is my suggestions:

First is the "maximum compatibility", when using hacked, 2M total (512K ROM, 1.5M RAM) MICROTEAM card. This 2M address area also can be used later by the All-in-one interface.
Second with standard MICROTEAM, then the optional RAM2 can be used. This configuration can be the default.
Third is alternative of the first: when enought ROM used externaly, then not important the internal flash (it is important when just SD interface used), then most of RAM2 enabled instead of Flash.
Questions:
-is possible remap the last 64K of Flash from 7C-7Fh to 00-03h? It is need also some address line playing.
-is possible add configuration jumpers? For example disable the RAM2, select the first or third configuration...
To Bruce: i left 08-0Fh for the EPNET, it is will ok? When not need the ROM/RAM expansion function from the EPNET card, because many other ROM/RAM in the system. In the first configuration also possible put it to 80-8Fh.
Some notes:
Putting ROMs to x0-x3h are not requried because the EXOS are also upgraded with this card.
ZX Emulator ROM don't need to be putted 30h- , it is can be putted to start of any 64K bank.