I'm somewhat puzzled by your post as you don't seem overly enthusiastic at the prospect of having your vows reinstated and I'm wondering if this is because it effectively requires you to admit your guilt in public?
Is your husband's son a cleric, priest, rabbi or similar? If not, I can't see what benefit other than appeasing his ego can be gained from this shindig as any vows that are 'reinstated' won't be any more binding than the ones you previously made and broke.
Tempted as I am to point you in the direction of children's poems such as 'The Spider and the Fly' or 'The Bubble and the Rock' for your dd to recite on your second big day, I suggest that you give consideration to collaborating with her on writing a short ode that comes from her heart.
Alternatively, the following wouldn't, to my mind, present too much of a challenge for a 9yr old to recite in company:
'May the sun bring you new energy by day
May the moon softly restore you by night
May the rain wash away your worries
And may you live your lives in peace, love, and happiness'
Or she could simply give the first toast 'To Mama and Papa (or mum and dad or whatever she calls you) ... 