This piston squirter mod is for a horizontally opposed flat motor. It will not generate much if any extra oil in a M10
Here's why.
The rod has a side clearance and a bearing clearance. You'll also notice the big end width is wider than the bearing width. This is for two reasons. One, this allows the rod bearing to be a proper width and the to give the crank shaft room to transition from the vertical counterweight to the horizontal rod journal via a nice rounded transition called a fillet. These fillets are important as they prevent stress risers and the crank from breaking. The rod bearing clearance is what keeps oil under pressure. Kind of like your thumb over the end of your hose. After the oil escapes out of the bearing clearance it is slung around and escapes out the side of the rod. Which brings us to rod side clearance. Some people wrongly believe this is a spec. It's a minimum value. The difference is on a spec if you have to much then you have a problem. You can have tons of rode side clearance and it won't hurt a thing. Some race motors run with 1/8" if they're running certain classes where this would be advantageous. It does not effect oil pressure at all. Side clearance was designed to "keep the rod centered" but some aluminum collars on the sides of the pin will also work. So whether you have .020" or .200" side clearance is a non pressurized area. There's more of a slinging effect. Now if you wanted to put a piston cooler on a m10 because you were convinced that you needed one. The best way would be to drill a hole through the rod and then through the bearing to tap pressure off of it. Many japanese sports cars come with this. The unique thing is that almost every aftermarket rod manufacturer dumps it later. So factory rod comes cooled. Aftermarket Crower, Eagle, Tomei, etc don't come piston cooled. They say it wasn't important anyway and more oil pressure is better for motors than more oil cooling.
So if your fighting gravity, not really that great. Probably didn't need it anyway.