Negatives on the paralettes were very productive for me. GTG style if possible, if not something like 10x1-2 two to three times in a week. Every 3rd WO cut the volume in half...Louie Simmons had a nice article on I think bench assistance exercises and talks about his guys working up to HSPU's on rings...like sets of 15. That is freaking strong.
The various bent arm/leg options are more for free standing press to handstands.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."