One cannot be a Minister and a Senator.
How about we make a flexible bill?
Based on the number of citizens:
Less than 60: 1 Justice, 3 Senators.
60 to 79: 3 Justices, 3 Senators.
80 to 99: 3 Justices, 5 Senators.
100 or more: 3 Justices, 7 Senators (the Constitution's default).