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I guess I was mistaken but I thought you could re-fight bosses if the castle had changed, but according to the wiki, it's not. rogue-legacy.wikia.com/wiki/Bosses
You can still get items that do not roll your stats. I sometimes find that I've picked up agility or intellect gear on my crusader. That being said, it is a lot more efficient to roll a strength class to gear a templar.
You should check out strafe + night stalker + preparation/punishment build. Very similar to the resource free barbarian builds (now removed). The build requires quite a bit of hatred gen and crit but it is fun IMO.