Not sure if stroker plates will move the cylinders apart enough to make it more convenient for dual carb intake, it will still be tight. But for sure will make all out of alignment as stated by RUBONE. Do a search on the board, are quite some examples of dual intakes. Frenchowl, Enigmas, Frankenstein and other members have over the years shown pictures of creative dual carb intakes.
I bought 45” stroker piston from T&O when they first released them some years back. I have no idea if they have changed the design later. Here is what I learned:
I set them up with 0.0021-0.0024inch clearance. Rear seized! Not dramatic, could restart bike immediately after, but enough for me to tear apart.
I talked to T&O and they informed they had learned the same and they experienced the piston grew more in size when hot compared to what they had expected/normal for this type of pistons. They now recommended a clearance of 0.0035 to 0.004 inch.
I re-honed the cylinders and set them up with 0.0035 Inch clearance. As a note, I have sleeved cylinders, skirt oilers and have had no problem since, but still not pushed the engine to its maximum as am still in brake in mode.
To the cam-ground pistons or lack of such, I looked through my notes, but could not find what I measured the T&O pistons to, but for sure I remember them having a slight cam. Remember they are much shorter and by that they will have less cam as the longer standard pistons.
To your question of an oil groove.
Not sure if you want to have the piston protrude below the cylinder skirt all the way down with minimum clearance to the flywheel, and by that collecting oil in a groove in the piston?
Not sure if it is a good idea to let the piston drop below the cylinder skirt. May have it wearing on the edge and introducing additional wear on the edge of the cylinder skirt.
Maybe I did not understand your question, a sketch would help.
Adding piston skirt oiler inside the cylinder was not such a big deal, all can be done by yourself if you have the time and patience. Descriptive instructions in Panics booklets.