Hi,
1) Yes
2) The normal front crs for that frequency
3) "Do you think it would be possible to generate backcourse conditions at the gate when all the gates at my local airport are on the front side of the loc antennae?" Ans = No
"i.e. how do the EIU's know that you are on the front or backside of the antennae?" Ans = They don't know where you are in relation to the antenna.
If you take off from a runway with an ILS tuned and displayed, the sense of the LOC is still correct after you have flown over the LOC transmitter and are now on the other side. If you then turned around to fly the back course in bound to the reciprocal runway, the LOC sense will still appear to be correct.
e.g. Consider an ILS front course onto Rwy 27 and you are a bit South of the center line. The LOC deviation bar will suggest you to turn Right a bit towards the North. Now consider heading East towards the reciprocal runway, flying the back course and you are a bit South of the center line. The LOC deviation bar is still suggesting you fly a bit to the North, but because your ILS display is "inverted" (still referenced to 270 but heading 090) the displayed sense is to turn Left now.