Yes you can vary the amount of crab - personally I have always found that doing this is a LOT less instinctive and slower than varying the wing down and leaves a low hour pilot behind the aircraft.
But again it's a lot less instinctive to you because the wing down is what you are used to and comfortable with. I don't even have to think about a crabbed approach it's so ingrained, everything is automatic and I've
never landed with a side load on the u/c.
Out of interest though I'm taking up a very kind offer from an infinitely more experienced airman than me to show me the slip approach and make up my own mind as to the merits of both methods.