How to connect to Gardena system (e.g. Bewässerungssteuerung 4040 modular (1276) )

Dear Daniel,
Did you make any progress in your above mentioned question. At the moment I´m using a Gardena 4040 for 10 circuits (wired 24v) including a wired moisture sensor. I would like to replace the 4040 device by a rachio. But I´m not quite sure concerning the following problems: 240V supply, can the power supply be changed? Will it be possible to use weather date of europe/germany? Will it work with the 24v valves made by gardena?
If you have any own experience in that question it would be very kind if you could give me some feedback.
Kind regards
Felix