They’re designed to run constantly, and your GPU is designed to run with some heat. I highly doubt you’re maxing out either like you would with a demanding game. Fans are much cheaper than a new separate device, and your GPU will become outdated long before it dies to wear and tear.

Why will using your PC “run it into the ground”? Unless you’re trying to use it for something else simultaneously, it seems like you’ve already got a solution there.