Don't do it. The 2209 will give you welds with similar phase distribution, strength, and corrosion resistance as the base metal.
The C276 would work, but you would need to test and qualify the welds mechanically and for corrosion resistance. You might create galvanic corrosion issues using the high alloy material.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection