I'm not happy with the awning window anyway
How about leaving the frame intact and replace with a basement replacement window to size?
When you say basement window, do you mean a "hopper?" That type of window normally has a handle at the top of frame which you would turn to open. The sash would drop down and open from the top, whereas an awning window opens outward from the bottom. If this is for a bathroom, I myself kind of like the awning window because you can leave it open a little for ventilation and won't let the rain in. Don't be turned off by awning windows, yours is just an older style. The newer vinyl windows should have better hardware on them.