The pro mini will be unable to control the Neopixels. It is in another location (serial via bluetooth). Is there no way of programming the neopixels to "do this until I tell you to stop".
Abort signal on images? This sounds interesting. I will look into this more. However, there is a total of around 100 - 200 images. I had to remove them from my code here because it went over the allowed character limit. I dont min'd stopping half way through an image, if it saves me finding abort codes for 200 images.
If it is going to be completely impossible to run the Neopixels and TFT simultaneously, I guess I can get another pro mini to handle the Neopixels, I'd rather avoid this though.