I’m just starting something similar. Not far enough in to recommend anything, but I only have about 1:30 during the week and 2 during the weekend which has led me to my setup.
I’m doing SSB Mid and adding in endurance in a few spots.
An extra 30 minutes of endurance after the workouts Tuesday and Thursday.
A 1:30 endurance ride Wednesday and on Friday.
The Saturday O/U workout I’ll do 30 minutes of endurance aftrwrward.
Gets me to 10 hours a week there. Just completed my first week so like I said not enough complete to tell if I’ll need to scale back or what improvements it might generate. But just an example of what someone else is doing.