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Much depends on time of day in RP but I'd go with no for that particular section, plenty of walkers along there. Other configurations could work..
For 500m sprints, you could make the stretch that runs Attenborough's Pond to Martin's pond a go, slight uphill but less bike/car traffic than the outer lap.
Broomfield is ideal for a steep hill climb.
The TT could run something like below but is a bit short, some of the roundabouts will be a challenge and pedestrians could be an issue in the middle roads if it's peak weekend hours.
https://www.strava.com/routes/17401398
Does anybody think I could get away with this (whatever that paved traffic-free road through centre of RP is)?
https://www.gmap-pedometer.com/m/?r=7347593&rf=1