Then drop the casting times and the costs also if you feel like it. Rituals costs and casting times are there to prevent the casters overshadowing skill using characters. However, if you are willing to accept some imbalance then there is little to loose by shortening casting times to enable some of them be cast in combat.Yeah, my issue with rituals is that there are those like Comprehend Languages that are, imo, ridiculous taking 10 minutes to cast.
Alternatively let the players spend some resource to speed up casting line action points.