The best part of this conversion is it isn't permanent. The rake head and saw blade are readily interchangable.
A note about safety: I know some pedantic wanker will raise this but I figured I would beat him to the punch: be careful! Don't let the pole saw or any other implement touch over-head lines. Also when working on a roof be aware of your surroundings. Most of us are used to working in environments where you won't fall to your death. Don't become so focused on raking you fuck-up and die. Think and look before you step!!!