An update to our original Challenge Matches post requiring a best-of-7 match . . . that is no longer a necessity.
ANYTHING played through Match Play whether it's IFPA endorsed tournament play or not can still impact the Match Play Rating. This has evolved with Match Play not just specifically helping with the Challenge Matches system, but the IFPA officially endorsing the Match Play Rating as an "official IFPA metric".
So really all MP activity will be pulled through to the IFPA side of things, so play early, play often, play anywhere, play anything . . . just do it through MP