Are outward opening windows possible with window shutters?

If you want such windows, why not?

Absolute special features always carry a high potential for complaints and/or incur high surcharges because "rethinking" is the most cumbersome special request in semi-industrial production processes. Simply sourcing the stuff from somewhere less exotic then involves complications in the event of service cases.

is then associated with complications in the event of a service case

Of course. Anyone who buys non-standard should be aware of the potential disadvantages. In case of doubt, everything is always somewhat more expensive, including the service, which is not available just around the corner. That is also correct, because non-standard always requires more mental effort, time, and care. But that can be solved with money and is no problem if you are prepared for it and have made a conscious decision.