A version of one of these might work for your dilemma. Surely one of them can be tweaked to work for your window.

seeking information and specs on black window/door manufacturers that would work in multi-seasonal house

It's the window leaf itself that has bowed. Have attached couple of images that hopefully explain it better. It varies with each window but a lot of them have just warped all kinds of ways. The one below is probably a bit hard to see but has bowed in the middle.

Looking for a exterior color makeover for my 1990's Queenslander. Color advice needed for new roof color and exterior paint color for this plaster-cladded beauty. Unfortunately, house has classic Karaka green window joinery that can't be changed/painted (not in budget). I have to maximize my small budget with a paint job. I have a nearby standalone garage that needs the same paint job. We will clean and treat the veranda posts a cedar stain and I hope to add some stonework accents when I find the money that would give the house some more curb appeal; but for now, need to paint roof and exterior house and inject some WOW!!