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Boot Mode pin selector

Other Parts Discussed in Thread: SN74LVC2G66, TMUX1574, TS5A23157, TMUX1309, TS5A3357, TS5A3359, SN74LV4066A, SN74CBTLV3257

Dear members, 

We need to be able to have three different ways for burning the firmware into the micro. 

1- Emulator

2- RS232 driver User MODBUS

3- RS232 driver from our cloud

each of these ways has its own assigned pins in micro. I want to find a kind of chip that let me choose (or switch) between different pins while burning the firmware. In RUN MODE the connections are like:

RUN MODE MD=1

BOOT MODE MD=0 using USER MODBUS

BOOT MODE MD=0 using USER CLOUD

any suggestion would be appreciated. 

Farzaneh