convert 30 pin docks for lightning devices
My solution to your problem is to use the longer 30 pin to lightning adapter and lie the phone down rather than prop it up dock style, but I get the convenience of just dropping in a phone on any dock and not having to repurpose/recycle otherwise functional docks prematurely. I also just use one cable and bring it with my device rather than fixing all the docks (as I still use them with 30 pin devices more than I do with lightning devices).

If you don't mind the longer cable, get the Cradle with Audio port from Belkin - especially if you want the analog audio option or don't want to add height on top of the docking station.



If you need a commercial insert, the best one out is the Kickstarted project that ended funding 31 Jan 2013 that now sells the Flybridge insert commercially in packs of 1, 2 and 5 to save on both shipping and the per-unit cost.



Since these have been in the wild for more than a year, I've not heard of major problems and you might even find someone to fabricate a similar plastic insert if for some reason you don't want an injection molded piece or your docks aren't among the ones listed as compatible with the product.