Sounds like you have it handled.
Should work sweet.

I have seen this trick done in several ways and as long as the results are the same it works.

???? did you ballance the rotating assembly after all the mixing matching and machining.

Having a good ballance on the engine is a must.

Be sure to ballance using the Damper, pulley and flex plate you will use.
Witness mark the pulley assembly to the ballancer in case its off a little.
Make good and sure that your ballancer rubber is in good shape as well as the dampened pulley assembly.

Good luck

Robyn