Just saw this so it might be too late, but if you haven't moved forward yet, you might want to check out the Mogami lavalier mic cable, either w2697 or w2901.
http://www.mogamicable.com/category/bulk/microphone/lavalier/They are both 2 conductor plus shield/ground, so if that covers the conductors you need, it might be easier to work with over the 1804a. Both are smaller in diameter compared to the 1804a, the 2901 is only 0.085" so really small. The w2901 looks like it has even better specs compared to the 2697 (other than smaller AWG wire) and has great flex life.
I found it hard though to find the w2901 other than bulk spools, so I recently went with the 2697 for a right-angle interconnect and XLR mic cable project. I've used the 1804a on projects previously and both the 1804 and 2697 (and presumably 2901) are great cables, can't go wrong no matter which way you choose. For smaller size and easier production though, mogami might work better over the 1804.
The chopped/stubbie right-angle XLR cables I made with the w2697 are great -- make using my Line Audio CM3 mics (light and only about 3" long) like using active mics.