Don't think there's any quick fix to that, but removing the pan isn't such a big project if you can get the car up on a lift.
I recently replaced the gasket on our BW automatic gearbox (as you have). 24111203500 is the part# and BMW has it.
What I think was the original gasket that I removed was made out of cork, the new one I got from BMW was made out of really stiff "modern" green gasket material and it did not seal the pan, I had to remove it again, clean it, use RTV on both sides of the new gasket...
So, I would buy some cork material and make my own gasket if I ever do it again.
When you have the pan down, check the metal filter and clean if necessary.
If the kick-down wire shows any wear, now might be the time to replace it, BMW got that one as well.