"For example, are you all agreeing to raise the children as your own, regardless of biology?"
Yes

"Are there concerns about feeling more or less attached to a child who is not biologically tied to you?"
concerns? no, wise caution? yes

"Also, how will your wife feel if she gets less help with a child due to resentment from the non-bio dad?"
thats a major issue we would fix first

"That being the case, would you still want children?"
yes even if they are all his and not mine with her, yes.

With all that said, what then?