That is one reason for the walking stick I use. If I hold near the top and kneel, its a perfect shooting height for me. I can throw the rifle over my arm and shoot that way. And like Pluckit, I have shooting sticks in the blinds, or I am a tree leaning person. But shooting off hand is still good practice and a lot of fun. Also a good lesson in humility for me.
I have been doing a lot of off hand shooting with my .22 rifle. It should be helping me to get that shot off. With the .22 it does not seem so bad.