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sideways.vim
A Vim plugin to move function arguments (and other delimited-by-something items) left and right.
Maybe https://github.com/AndrewRadev/splitjoin.vim can be of interest to you since it provides similar functionality.
In terms of parsing, I have a sort of "public API" in my sideways plugin, which you could use to get arguments -- not sure how it compares to vim-textobj-parameter, and, like splitjoin, I try to hit a wide variety of targets, so some cases might be weird. I also see you're considering tree-sitter, but I guess I'll just leave the link if you're curious :).