Thank you both once again.
Yes, I will ask Cart-Power to give me a quote. On the other hand, I would like to have an estimate from you - eCom Labs as well, as I regard you as highly skilled developers and I have had, unfortunately, multiple strange issues with Cart-Power addons lately. Hence, could you send me a rough estimate for the aforementioned work and tell me when you would have available ressources to do the job? Thanks!