The league match time are arranged on season day 3. As I understand, association matches play at hours determined by the home team (please correct me if I am incorrect, thanks). The CL final match time is not arranged until the beginning of season day 26. So unfortunately the priority must be for league or association matches.
But it is really stupid that a match between Portuguese and Russian teams is arranged at 5 am in Portugal, or probably 6am or 8am in Russia. Is the Russian team owned by East Asian manager? I am not sure if time scheduling consider locality of manager or the team.
BTW, I do not play association matches. Do match time of normal matches separate from association matches for a period of 3 hours like normal matches?