The Minnie Van pick up is outside security. I think the question is will Minnie Vans pickup from Springs well before it’s open. To make rope drop in most parks you need to be there 30-60 minutes before official park opening. Let’s say park opens at 9, you need to be there between 8-8:30. Allow 15 - 20 minutes for the ride. And at least 10 minutes after requesting for the van to get there. That puts the OP at requesting a Minnie Van to DS at about 7:30 am. It seems unlikely, but I really have no idea if they would allow a pick up at that time.
Add in the time you need to walk there from your hotel. Seriously, save yourself time & half the money. Take a ride share from your hotel, allow time to arrive at the park of your choice about an hour before park opening & you’ll be fine.