Hi,
I’m fairly new to trainer road programs, so haven’t got specific plan recommendations.
Having recently done a 200km road race with similar climbing and also a endurance mtb event.
I personally focussed on getting in a lot of steady state intervals and then once a week went out and did a long ride in the hills about 4-5hrs. I didn’t focus much on top end power.
Be careful with doing the track racing weekly that it isn’t to much to get effective intervals in.
With the endurance events, you really need to have time in the saddle to know what it is like to be on the bike for 6+hrs and get the body/mind ready.
Good luck