That’s not how it was. The only two colonies who refused were South Carolina and Georgia. All of the rest were on board.
That’s 11 to 2, in case you needed numbers.
Why is this so important to you that you’ll go to such great lengths as to ignore the 11?
I am pretty sure you are mixing up the US Constitution (1787) with the Declaration of Independence. (1776.)
If you have evidence that 11 states were more concerned about slavery when they signed the Declaration of Independence (1776) than they were about their own freedom from England, I will be fascinated to look at it.
Now let's remember that Lincoln was referring to 1776 (Declaration of Independence) and not 1787. (Constitutional Convention.)