This is configured as one subleague with two divisions as opposed to two subleagues each with one division. Hopefully that is the correct interpretation of your description.
Code:
#
# 10 team schedule, 80 games
# Designed for the following configuration:
# 1 subleague with 2 divisions, each with 5 teams
#
#
# 16 games against 4 other teams in division (8H/8A)
# 4 games against 4 of the 5 teams in other divisions (4H or 4A)
#
#
# All games are in 4-game series played Thu-Sun
# One series per week
#
# Up to 16 games in row may be played home or away
#
# All game times set at 7:05pm
#
# Teams play no more than one game per day
#
# Season begins first Thursday after first Monday in April
# Season ends late August
# Season spans 144 days
#
# All-Star Game on Friday of week midway through season
# Otherwise that week is open
#
# Built 2019-02-12
#
The schedule will randomize the teams within each division every year. Each slot is filled by one of the teams from the division, which could be the team it was. A 5-team division may randomize like...
A -> C
B -> E
C -> B
D -> D
E -> A
Every schedule "slot" set gets filled by the random team the next year. If the first series was A vs B, it would be C vs E the next year after that randomization. The "D" above would fill its same slot being at home and on the road at exactly the same schedule positions since the randomizing did not change that team's slot. But the opponents would all be different because all of the other teams did shuffle.