I am using this workaround for the time being after my own percentage calculations from race predictors and my own testing:
3x
- 5k pace 1km Z5 Z5 HR 109% Pace
- Recovery 1m Z1 Z1 HR Z1 Pace
- 3k pace 0.4km Z6 Z6 HR 121% Pace
- Recovery 1m Z1 Z1 HR Z1 Pace
More or less based on this:
400m 139%
800m 133%
1500m 128%
1609m 127%
3000m 121%
5000m 110%
10000m 100%