Gogarty writes:

I have been toying around with ideas involving angle- or T-iron and big
screws, like jacks.

If these are thinwall tubing that is bent, you will never straighten it
with anything less than precisely fitted dies. Anything else will surely
kink. If it is already kinked, then you're unlikely to straighten it.

If it is as "captured" piece, you might consider splicing new tubing in
with fittings, something like hose barbs.