Ryan5252,
The CAA are perfectly happy for us to practice PFLs below 500' agl so long as we make the effort to stay 500' away from people, vessels, vehicles & structures.
FlyingKiwi-73
Chop the power halfway along the downwind leg and have a go.
Now that's just cheating! The biggest problem with glide approaches is setting yourself up to start the circuit from the right height & position. Doing it by the numbers from mid-downwind is too easy.
Stooge around in the vicinity of a friendly A/G airfield at 2-3,000' & when it's nice & quiet, cut the power & set up your glide approach from a more realistic height & from a random position.