You will have to drop the crank out to do the oil jet. It will be a lot easier to do engine out on a stand. You need to remove the pistons and grind away on the relief to make sure there is ample clearance or you will break the tip off again. If the oil jet tip broke off, it was because it was hitting the piston. Forged pistons expand when warmed up and it may clear barely when you look at it but when you start the car it's a different story. I would also rebalance the pistons to within a gram.
Your pistons will be noticeably louder if the oil jet tips are sheared off. I noticed the engine is a lot quieter ever since I fixed the oil jets. Oil jets are there for longevity and cooling purposes. The oil jets lubricate and cool the pistons which can reduce the likelihood of pre-ignition/detonation from piston hot spots. Linux may have run a long time w/o them but he has had trouble advancing timing to MSP like levels likely due to this reason.
I heard the oil jet relief is now finally machined more on the Arias. Too little too late. I would still check to make sure there is AMPLE clearance before going on with assembly on any brand piston.