They are not actually 100% necessary so it's still possible I won't fit oil sprays. But there are few options I'm thinking about. One is to do "BMW style" grooves like in the picture:

so the oil gets sprayed from there.
Or get a machine shop to do holes to the main oil line and fit nozzles like in the picture above:


They're decent thing for cooling down the piston and cylinder walls, but many turbo Pintos also run without any oil sprays so it shouldn't be a problem.