Yes this sure is possible to accomplish!
Don, you'd be able to find the CC kit in the US Quicksilver product guide parts catalog, the 2010 catalog shows kit part number 879288A39, So the 2012 should show the same i would assume.
879288A39
Front mounted kit. Full closed system which also protects the dry joint exhaust
manifolds from corrosion.
Fits 2008 and newer MCM/MIE V-8 (305, 350 & 377) MPI Emissions Control engines.
Engine Model, MCM 5.0L MPI Bravo (EC)(12)
Year Range, 2008 - 2009 +
Serial # Range, 1A300000 and up
Closed Cooling Kit, 879288A39 (5)(9) MSRP:$2,914.21
Belt Kit, (3)
Seawater Pump Kit, N/A. You have this already.

ECM 879172T04 Now
8M0059354 (4) MSRP:$1,678.57
Hose Kit, 879172A16, MSRP $616.58
(1) No Kit Available
(2) 889432A 1 Belt Kit: Order this belt kit if the engine is in a dual engine boat and you are going to remove the power steering pump and hoses from this engine.
(3) 889433A 1 Belt Kit: Order this belt kit if the engine is in a dual engine boat and you are going to remove the power steering pump and hoses from this engine.
(4) The ECM must be replaced when installing a closed cooling kit on this specific engine application. Due to the many updates throughout the year, the ECM listed may not be the appropriate ECM for your engine serial
number. Please check the latest Electronic
(5) Note the additional required kit(s) listed to complete the installation.
(6) Thru hull water pickup is not included with seawater pump kits. Obtain locally.
(7) 865188T01 Front Lift Bracket: Order this replacement bracket if the engine s/n is 0M600000-0M616622 or if a Bravo engine with an air actuated drain system.
(8) This hose kit required only if engine has 6 in. (152 mm) exhaust risers.
(9) Bravo drive applications require the installation of an additional thru-hull or transom mounted water pickup along with the drive unit water pickups. Order these components separately.
(10) This hose kit required only if engine has in-line transmission and 6 in. (152 mm) exhaust risers.
(11) If engine is equipped with 6 in. risers, also order Hose Kit 32-865998A01
(12) Emission Controlled engine
(13) N/A = Not Applicable.