Zipties and cage works. Strong velcro might work, but electrical tape probably just won't hold. If you want to get fancy and machine some aluminum for a mount, you can, but it's not necessary.
Getting bottles in/out kinda depends on your extensions. Ski-bends are tricky, s-bends better, but it's never easy for me. Old cage+old bottle seems to be the easiest. Speedfil, aerohammock, Torhans all work pretty well. DCRainmaker's reviews are also good, so +1 there.
But to the extent you waste time fighting it, you're...wasting time. And you seem to care about that detail. -Jason