Thanks all for the helpful feedback!
In addition to being curious if I can make a drinkable beer, the "fertility" of the air what I'm trying to gauge. We've had great luck with sourdough bread from a starter I made using dried spent grain run through a food processor to make "flour". But that's upstairs in the kitchen away from all of the fermenting fun. Part of the reason for doing this is that I am curious what the microflora in my basement are like after 7 years of brewing everything from American Pale Ales to pseudo lambics but focused mainly on Belgian Trappist and farmhouse ales. If it turns out my borderline OCD cleaning regimen has thwarted the critters from establishing themselves, I have a lemon tree and a raspberry plant in my yard so there is a possibility of completely unprocessed, unwashed produce to put in the room with the wort for the next batch.
In re the question about racking into a closed fermenter: yes, that's the plan. I am anticipating a week in the "koelschip" pan and then into a 5 gallon secondary. For this first batch I will rely on a big ass "splashless" funnel, but before I do another I am going to go to the home-brew store and pick up a bottling spigot to mount in the bottom of the tray to reduce the probability of sticky goo all over the floor.
Moldy wort would not be a problem, it would be a learning experience! I have no illusions that this first batch will produce anything drinkable. If it does, that would be awesome. If not, I have an experiment under my belt, some datapoints I can apply to future experiments (for instance: I imagine I should be waiting until winter to do this but I'm actually curious to see what happens), I've freed up some valuable refrigerator space which will make the wife happy which means she will be less annoyed by my excessive brewing habit.
If it goes well, I will do an actual all grain lambic recipe next and go for an actual ambient fermentation lambic. If it is a bust, I will wait until the weather cools down a bit and try again. Either way, I'll keep adding info here as requested.