It's even easier buying the trout you need as it's not like they are expensive.
Seems like a lot of trouble and expense to potentially find out you could have used your resources more wisely. From my experience with trout in a pond, and what it would take to complete you plan I see all kinds of problems.
BTW not only will any predator fish you add gobble down what fry you do produce but so will your trout.
Not trying to be negative but just trying to be frank with you.
