All of the above sounds great, and your self-insights commendable!

The only thing I would change, is "I will simply say Ok have a great time" - don't wish him a great time with OW. His way of living right now is disrespectful of you, so don't act as if you approve.

M 16 yrs, WH62, P54
3 adult blended kids
EA 11/13, BD1 6/14
PA fall 14, BD2 2/15
Piecing 2015, BD3 12/15
Separated 4/16
WH moved OW in 5/16
Divorced 6/15/17