If the piece I wanted to bevel was too short for safe machining, (and I really wanted to machine) then I would run a safer, longer piece through the saw/router, and cut off what's needed. That occurs to me because I have 'done it before'.
I also don't forget the 'terror' a novice might feel when contemplating a 45 degree planing job; especially as said novice might also have problems sharpening tools. Isn't this why the OP asked in the first place? He clearly wants a method that will ensure an accurate job without hassle.
I hope he gets some kind of an answer. :wink:
I didn't 'suggest' he make a shooting board. I pointed out that if he didn't have one, he'd need one, in order to to make one! (hammer)