So I ended up posting the car for sale on Facebook Marketplace since I could not find any feasible solutions. All the shops seemed shady and charged an arm and a leg to rebuild or replace.
Luckily for me, someone recognized the car from the forum here on Facebook marketplace. That person referred me an outstanding transmission shop here in Houston and the car was towed there today. Supposedly it will be finished tomorrow. The tranny will be replaced with a fully rebuilt unit with a billet torque converter. Trans cooler and oil lines will be flushed. Couldn’t be happier when I talked to the owner of the shop as he seemed extremely knowledgeable about the 6l80e. I also saw like 50 other Chevy’s there for 6l80e replacements.
The best part, the new tranny will come with a 5 year old/100k mile warranty.