Welcome
.
"is it safe to get it welded?"
Yes. It is much safer than a broken seat.
"If I can't weld it, is it possible to take the hardware from the bottom of one of the wrecked seats and have my good stuff put over it?"
It sounds like you don't have a power seat. Yes, you can replace it with hardware which fits.
Or if you can post a picture of what you need, I'm sure there are CEGers who are parting out their cars who can help you.
