Of course there is.

But it takes lots of money to built the programmer.

More money than the chip is worth.

And high-voltage programming means that if you have an error in your home-built programmer, you fry the chip. Then you have a broken programmer and a broken processor and have lost a lot of time and the money you spent for parts to the programmer.

If the programmer "works", then you have a problem that too short programming time or too low programming voltage can result in a chip that looks programmed. But some memory cells are marginal and will give read errors now and then - more and more as the time goes since you "programmed" the chip.

And if you do program something, but finds out that there is a bug and you need to reprogram, then you first have to erase the chip. Most probably, you chip already have contents now, so needs erasing anyway. To erase, you either have to wait a very long time with the chip in the sun. Or buy a special UV lamp (that has a very dangerous wavelength making it important that you do not look into it).

So the end result is that you will hate microcontrollers, or even electronics in general, while you throw out your now totally worthless gear.

Why should we recommend you to take this route, when we more or less know that it will be very costly or a failure. But most probably both.