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yeah... I suspected that would be the case...

Then I'm sorry to say that I don't think there's a solution for this. Inventor need to recalculate the relationships in order to know wehter or not the constraint is inconsistent with another constraint and I'm pretty sure that can only be achieved through update/rebuild.

I can't say I'm 100% sure though, because when adding a constraint, if it works, the component will jump in place as a preview before you hit apply. So Inventor must have some way of analyzing this before the constraint even exist. I don't think any functionality like that is exposed through the API though... Even if it did was, I'd guess the assembly would have to be up to date for it to work, so I don't think adding multiple constraints without updating the assembly before each one would work either way.