That is a LOT of headspace. You don't have anything smaller to put it in? Or is that just a temporary container? Maybe someone here can advise you about how much k-meta might help protect it for 6 weeks if left open like that. And I don't see much solution in your air lock, although with that much air in the carboy it probably doesn't matter.
And maybe I'm misunderstanding you, but you said after your first application of fining agents (KC - Kieselsol/Chitosan), your wine "cleared right up." So you racked it off the lees. Are you sure you left all the lees behind? Was it still clear after racking? I ask because then you added another fining agent "to clear it a little more." In my books, clear is clear. If it can clear a little more, then it isn't clear.
The only problem I ever had with KC is when I accidentally stirred up the lees after the wine was clear. It originally cleared in 2 days. After stirring up the lees, it was still cloudy after a week. If that were my wine that I had to leave for 6 weeks, I would add 1/4 tsp k-meta per 5/6 gallons of wine, get it into a carboy with minimum headspace (wine into the neck where the surface area is smallest), add another dose of KC (DualFine, SuperKleer, Claro K.C., Kieselso/Chitosan - all different names for the same thing) as per directions, and make sure the air lock is at least half full with sterilizing solution. In six weeks it will be clear, clear. If not, or if not close, then something about the gelatin messed it up, and you can experiment then, possibly with small samples. Or, as mentioned, maybe don't even add the KC. It very likely will clear in 6 weeks without it.