Hi Paul,
Don't know about the bullworker gadget but I have been using the upper body machines at the gym and have found them to be of real benefit. Also I bought hand weights and use them when walking. When I am on a deserted bit of road when walking I do arm raises and the other one which is quite effective is to hold the hand weights at waist level and swing them to the other side of your body so you are twisting your waist (you look a bit stupid but it works on your obliques).
I'm not sure about needing extra protein, I hear mixed messages maybe someone else can answer that one ...I think it depends whether you want to look like Arnie ...