Post I-130 approval questions

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My I-130s for my parents were recently approved. I posted a question and received answers on filing I-485s for them to AOS while they're in the US for a few months right now (as opposed to filing in their home country when they go home in a few months). A few follow-up questions if anyone has had experience with the following:

1. Is it too risky to file for AOS because they entered the US on visitor's visas? They really have no intention of staying here permanently (even have their return flight tickets and weddings to attend at home) but I read on one of the posts in this forum that filing AOS paperwork when family members enter the country on visitor's visas is risky.

2. I still haven't received any information/update from NVC (no case number either) so what do I do if I want to proceed the route of applying for their AOS while they're here, as opposed to proceeding with the NVC process? Do I need to notify NVC of something? Do I do something in response to the notices/fee payment letters they send me? If so, what?

3. Completed I-693 forms have to be filed with the I-485 application, correct? I'm confused because when my husband filed an I-485 for me years ago, I did not submit the medical stuff until we were at the interview before the immigration officer.

TIA!

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Update: The paperwork they had ready to go was for the NVC process, but I still need to get all those documents mailed from their home country. So the timing of all of this may not work ultimately. But it looks like both processes require the same supporting paperwork so there may not be much more to collect apart from what they already have gathered. We're okay proceeding with either option, but just want to make sure that the option we pick isn't something that is a big no-no.

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By way of update, I decided not to go the route of filing their I-485 right now. We'll just wait until they go back to their home country in the fall and go the route of the NVC.

That said, once the NVC assigns case numbers (hasn't yet) and I pay the various fees, is there a time limit within which I must file the I-864 support package? I know there is a guide on here for Flying through the NVC, but is there a way to slow things down so that they don't have to return to their home country for the interview mid-way through their US trip?

Many thanks.