I would go for the Low Volume plan and move the 3rd workout in 1 day. This would give you a format of:
Mon: Rest
Tue: High Intensity
Wed: Rest:
Thu: High Intesity
Fri: Aerobic Endurance
Sat: Rest
Sun: Rest
As an example, the Low Volume General Build plan would go into your calendar like this:
If, after a while you felt you could manage more, you could switch the middle rest day for a short endurance ride (eg. Pettit) for some extra TSS without the intensity.
You could follow this pattern right through Base, Build and Specialty.