Have the converter installed into the housing using Inon strobe(s).
You can just bridge two bulkhead pins with a 100 kilo ohm resistor and have the modeling light & laser activated as soon as you turn them on with the Z220’s switch.
To activate modeling light and laser when pressing the trigger halfway down you have to connect the AF signal output from Matthias converter to a certain bulkhead pin (might sound complicated but it is not. All described and simple to connect with Matthias's instructions).
Unfortunately my 10D was frozen several times (for a few seconds) with the second combination (modeling light and laser activated by trigger pressed halfway). The camera did not freeze with configuration one (modeling light and laser always on when switched on).
In other words: The converter does it's job so far. But the additional feature to have the Z220's modeling light and laser controlled by the 10D's shutter trigger might cause some problems in my particular case.
However the E-TTL conversion works and you can use the Z220's modeling light and laser. Eventually not controlled by the trigger but by switching them directly at the Z220.
Maybe someone else can confirm successful Z220 operation including modelling light and laser controlled by the camera. So far I have not heard of someone else using the converter with Z220. Only a 300D + converter + Z220 (no probs so far).
Julian