1. Yes you can give an application before.the hobble court stating.that.you fear charges and false.allegation on perusal from.honble court you made up.mind but now you don't wish to as there is inherent fear.
2.no.this.wont amount contempt of court inform court in advance.
3. refusing won't cause much impact as ground pleaded is adultery.
4. See it won't effect child.custody if not possible for parents to live together some compromises has to be made but in my view it shall create a positive impact as for daughter can stay together for 7 days just take care of things.
But since risk of sucide is there you need to be extra cautios and can bring same.to notice before court.
And further seeing her tendedcy the child custody shall be given to you.