Originally Posted by goldener
to keep the same chain length, keep the sum of the cog/ring equal. thus 44*16 and 42*18 (both sum 60) yield the same chain length, i.e no axle movement in the dropouts.
I think popping a chain link in is probably easier that swapping chainrings when you flip the hub.
FWIW, i'd try it, and then try the half-link idea. I had to add a link going between a 16 and an 18 tooth cog because with the smaller it was right in the middle of the dropouts so the bigger cog pulled it all the way out.