Hey all..some backstory:

Decided to do a drain and fill on an '07 Aveo... the threads on the drain plug ended up stripping ...
So, a 10 minute job evolved into hours since I had to drop the pan and muscle the bolt out. Then I had to chase the threads on the pan and find a temporary plug. I ended up with a M10-1.5 hex bolt, which is leaking because it has no taper and it apparently cant grip the gasket. Also, it appears that the pan gasket is leaking since I did not replace it.

I'm waiting for a replacement drain plug Dorman 090-078 (ordered from NAPA# 7041049 for $2.49). It's not specified for Aveo, but the specs seem to be a match and it appears to come with the plug gasket as well.
I'm considering replacing the pan gasket. The gasket kit Power Torque FK395 also comes with the transmission filter.

If I decide to use a sealant on the pan gasket, what type should I use?

How easy is it to replace the transmission filter? Does it involve removal of any other components, or is it readily accessible after dropping the pan?

Any tips, answers, and suggestions are appreciated...thank you.