Your story is great. I can see why you like swordtails! You're lucky to have a pond.
Kafuensis can take bbs but I always add green water for 2 days too for smaller fry (females).
I've never seen Chunga so your guess is as good as mine. My Mambova fry sem to be mostly reds like in the article but that is not a great photo of them. My otehr line should hopefully produce more blues. The Kayuni and Nanzhila show better blue.
The high 60's are too low for Nothos. They might live just fine but not spawn much. Also too cool for egg incubation. 73-76 F is perfect. If tanks can warm up in the day and slowly cool at night that would be ok. I'd stay away from small heaters. Maybe well placed incandescent bulbs around tanks during day to heat the immediate area. 60's is too low to hatch shrimp too. You'll need a light/heater on the hatcher to keep it in 70's to 80F. Now Aphyosemions and Austrolebias would love the cool temps.