Steel toed boots tend to be heavy. This is because they are made for work environments having overall heavier construction beyond just steel toes. They are overkill even on the rockiest tread for multi day backpacking.
FWIW both the Keen Targhee and Voyaguer already have substantial hard like rubber toe bumper caps. This is one reason I have liked both those shoes in low and mid cuts on rocky travers and off trail hikes of moderate daily mileage and or heavier loads in remote areas.
I like what RangerZ said. Look for ANSI approved fiberglass toed boots that should be lighter wt for work and hiking if money is that tight. Really though a lighter wt hiking shoe can offer major benefits over super heavy work approved boots.