Thank you, drayson.
That's indeed some solution and it is definitely very useful to know about it. However, in my case the support and main print switch between each other so often in the gcode that it would be really painfull to switch them manualy. BTW, my gcode has ~70 MB so you can just guess how many lines does it have and how many points when the extruders have to be switched...
Anyway, for right now I found some other solution: I figured out that Repetier Host (software which uses slic3r) allows to easily choose the extruder for the support and main print. I haven't done any experiment yet but it looks like it will work and I will definitely let you know about the result.
The only thing is that I prefer the gcode generated by Cura (the prints look just better) so if someone can add such a feature to Cura (even as a plugin) that would be a really mazing!
I read a post on this topic a while ago - don´t know if you mean this, but take a look here:
If you try, please post your experiance as I also started using my second nozzle a week ago...
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