Obviously most of block perks won't work but I'm just wondering if I could do a power bash with my bow, since bow have a bash-like attack
does anyone tried this? i don't feel like wasting perks in block (since i do not use shields) if it won't work :/

I have read that power bash and disarm do indeed work with bows, but I have not tested this myself. If you're on PC use the console to give yourself the perks and try it out.