You would need more than 60m for speed endurance to come into play. The athlete won’t reach their top speed with such a short distance, and therefore, all you could hope for is sub-speed endurance. Pure speed and Special Endurance are all you can work on. It doesn’t take long for the athlete to get their speed endurance up once they are outdoors.
A longer track would be good for max speed development but what’s available here should be enough for speed endurance (walk backs or backand forths) Generally, the shorter the track, the longer the SE (more reps) in order to compensate.
Speed needs a bit more space but you have to go with what you have for that period. In other words, you’re working off the speed that you have in place already, working the longer SE, then relying on moving up the shorter SE- and the speed when you get to a longer track or an outdoor training camp.
This is where training flexibility comes in. If you had the full space for Sp and SE, you might use a spring training camp for tempo on the grass. In this situation, you’d try to work on recovery for at least a week before the training camp and use the camp for Speed and SE work.
Sorry for the tangent, but irrespective of space would it be a good idea for the introduction of longer intervals for short SE to do EFEs and FEFs in the same way that top speed is introduced (e.g., 40-40-40 m, 50-50-50 m, etc)? How would that fit?