What risk??
Have you actually done the math?
You want to go the long way on nothing.......
You will make a clutch of POSIBLE hets.
You will have to grow all of them out so:
Then all the males are worthless to you because your female carries nothing but NORMAL
Two (2) to three (3) years to grow out all the females IF you get any in the clutch.
Don't forget you will need more housing to keep all of these.
You will also need to buy more rats to feed all of these (Do you have a supplier?)
The after you have tied up a couple hundred ($100) dollars into each of those females your STILL only have POSSIBLE hets.
Now you will need to breed the het male back to all of them and hope that one of them proves out in the first year. (Can take a couple years as well)
Let me just give a little simple guestimate math for you.
You get lucky and get three (3) females.
$200 each to get them to breeding size in rats.
Now you have already spent $600 on POSSIBLE hets.
What kind of male could you buy to put to your existing normal for $600?
You could buy a pied male for that!!
If you cant wrap your head around this then you are going to have nothing but problems.