It�s your pond and you are free do exactly what you want. Most of us have killed a few fish. I know I have. I think your plan will work it just needs some minor adjusting as the fish grow. After all that was the plan from the start. Put them in , grow them out to size and move them to the big pond. Leave a few to start over and repeat as needed for forage.

Thanks for the update. Let us know what happens.