With a trainer and HRM you can use Trainer Road to do power*-based workouts. They have some basic plans there too, or you can build your own from the 100s of workouts they have available. Any of the power-based plans can be done with TrainerRoad.


* - 'virtual' power, calculated from your trainer speed - all you need is an ANT+ speed sensor. There are a ton of threads here about TrainerRoad. (trainerroad.com)

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http://ironvision.blogspot.com ; @drSteve1663

A buddy of mine did this and it went well
You could do most of your training with TrainerRoad and Virtual Power. He in fact did it with Golden Cheetah, but same idea.
As race time approaches and you've zeroed in on your FTP, do a long ride at 80% of FTP and look at your HR and feel your PE. This is roughly your race pace.
Go outside and do a few race rehearsals using that HR and RPE. Ride for 3 hours and do a brick. Adjust if needed.

I don't know how much you weigh or what type of gearing you have but be prepared to do a lot of climbing for the first part. If you don't have the right gearing and you're heavier, you may burn a few matches on the first 1/2 hour.