That's an interesting approach. I read on a different thread that GSP axles were good enough and last up to 3 years or more. So with that thought, I'd have to buy the GSP axle for like $210, reboot the axle with a Toyota kit, and install it. Total damage would be ~$300ish. My actual concern is the outer spline and how it would mate with new axle flanges. I don't mind being the Guinea pig to try this out. With all this, if it lasts for 3-5 years, It is still a win. With Inflation, Money today is better than the same money tomorrow. So spending $900+ on brand new OEM axles for a 15-year-old gas guzzler seems a bit much for my use. Folks who do a lot of wheeling might have a different requirement and I understand their strong dogma on recommending OEM axles.
My aftermarket CV experience is the thread I'm referring to.