Broke out some of the 2019 pickling experiments for testing, these are the results:
Chinese Red Noodle dilly beans -

Turned out really well, even without the addition of crisper salt... and very eye catching, almost as red as canned beets. The crunchiness is spectacular! I'll be making a lot more of these in the future, but with less vinegar, and more mustard seed.
Okra: Tried 3 methods:
(1) cold packed & canned with hot brine
(2) pierced, then cold packed & canned with hot brine
(3) blanched, then packed & canned with hot brine
(1) was OK, but a lot of air that had been trapped in the pods emerged during the water bath.
(2) was better, the brine penetrated the pods, so there was very little trapped air, and the pickles were firmer.
(3) well, it was worth trying, but the quality was sub-par, soft to the point of unpleasantness. The water that entered the pods during blanching probably prevented the brine from entering rapidly, and also diluted its strength.
Pierced pods cold-packed will be my go-to method in the future. I'll try using some crisper salt this year to see if the firmness can be increased even further... but I'm quite happy with the #2's, nearly as good as the jars sold in stores.
Bitter melon:
Made two batches, sliced lengthwise into spears, then cold packed with hot brine. After some web research, packed a thick slice of fresh ginger in each jar. The flavor turned out OK, I could easily get used to it... but the texture was a fail, far too soft.

I didn't use crisper salt in these, but doubt it would have made a difference. I know a bitter melon recipe for refrigerator pickles, but am trying to can larger quantities to add to our diet year-round.
Making canned bitter melon pickles is proving to be a challenge, due to their soft consistency. I'll try both cold brining this year before canning, and salting for 24 hours before pickling... and I'll try picking them when smaller. It could be that only certain varieties are suitable, or this project could be tilting at windmills; only time will tell, I suppose.