There's a couple of important things regarding spark plugs to remember with these being supercharged engines. It's not just plug dimensions that determines cross-compatibility.
Being supercharged, they will have a different heat range than a NA plug. This difference is identified by the depth of the void along the element inside the outer housing. The depth of the void adjusts the heat dissipatation qualities of the inner conductor.
Different plug manufacturers will spec their heat ranges according to varying criteria, including electrode material itself. If the engine were naturally aspirated, it would hardly be an issue at all. For forced induction, it can be very important to preventing detonation.
As far as electrode material, iridium is chosen for its best in the periodic table resistance to corrosion, second highest density in the periodic table, and very high mechanical strength. Ironically, it is not a particularly good conductor at normal temperatures.
It is its density and corrosion resistance that makes it a desirable material in spark plugs because it loses so few atoms during each arc event, and has them so tightly packed. This is why iridium has such high intervals between changes, especially extended high rpm environments such as marine.
Changing plugs each year is certainly not required, they can be easily cleaned. At about $18 dollars each, I can definitely spend the money better elsewhere.
In short, I wouldn't try substituting plugs unless you are modifying the engine.
If someone insisted on changing plugs each season, I would recommend staying with NGK for the same heat range standards and simply using a copper plug.