From the choice of three, I'd pick the middle logo. Colours localized in the centre would be better than having colours all over the place, given the choice of the Empire's colours. And with Richard, I agree to the horizontal flag design. Though we might want to reserve the first design for a vertical bunting or standard.
Not to sound nationalistic or anything, but are we allowed to combine outposts from 2 different countries? It just doesn't sound right, plus we might run into problems should either party have their own fan base and wants to have their own organization. No offense to any Brunei fans ok... Just putting in my .02
IMHO, leave the decision wherther to be combined or adopted be left to the Brunei fans who are planning or already part of the 501st.
No point in forming an Country-based Outpost if there is only 1 solo member for a very long time.