I recently went through this, needing to convert my high impedance Zulu to a low impedance aircraft. After going through some people who only pretended to know what they were doing, I eventually ended up with a battery-powered converter box. This works well, in that I can use my headset, but screwed up the vox system in the aircraft, resulting in my mic being permanantly open; ok(ish) if you're flying on your own, but a bit tough on everyone else if you're not.
If you're particularly interested in the specific differences between the technologies, drop me a pm.