DaHai8, you're THE man - as always :-) Thank you very much, I will give it a try tomorrow afternoon (when my wifey is outa home :-) )
@ Zerspaner_Gerd, unfortunately yes as there is no option in a dual setup to heat only the one required nozzle and not both. only workaround is to use a single setup for single prints and there is no nozzle selection possible... so thanks to DaHai8's magic there is again the possibility to select the nozzle on a single nozzle print without manual tweaking.