If it's closed as is I would mix Titebond 50:50 with water and after washing my hands (very important Titebond will carry dirt from hands into crack... crack on guitar....) rub in the wet Titebond pulsing the crack from the underside to encourage the glue to wick in. When you can feel little beads on the underside then wipe the top clean of glue and apply a bead of full strength Titebond and pulse the crack again wicking the glue in. The thinner Titebond acts as a carrier to help the thick stuff get into the crack.
When I feel glue on the underside then I place wax paper on top of the crack after wiping off excess glue, then a clear plexiglass sheet (I like clear so I can aim my magnets) and then two top side rare earth magnets the good ones not the wimpy crap Lutherie supply houses sell but with at least 42 pounds of pull per square inch. Two on top, two on the underside with wax paper over them so you don't glue the magnets.
Wait a day, remove magnets, plexiglass and wax paper. Clean up with hot water and Bob's your uncle. You could cleat it but I don't see why it. It cracked because of an impact not being dry so cleating is optional and won't hurt anything, use a diamond shape with beveled edges no more than .050ish thick.
This as cracks go is as easy as they come to fix and the powerful magnets will ensure it's level when done.
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