Prime is an amazing tool.
It continues to detoxify ammonia (up to 1ppm) for 48-24 hours depending on the body of water, the amount of Prime added, and the amount of ammonia.
You can overdose Prime up to 5 times (on the instructions it says to do this in such a case as nitrIte poisoning) with no ill effects. I wouldn't be worried about overdosing your fish with the Prime, just ensure there is adequate oxygenation happening with your water.
You can always use the tub/basin idea of "aging water" but instead of just letting it age, add Prime, and let it age for 24-48 hours before use. This would be rather tedious, and I believe unnecessary.