I could also see Swipe with an unarmed attack.
Aside from Thrash/Collateral Thrash, you could also treat it as a normal unarmed strike, just reflavoured as head bonking. That said, grappling twice is already 2 actions, so to make 2 strikes (one per enemy) as well they would either need the quickened status or something like Flurry of Blows/Flurry of Maneuvers.
But if you're not looking for specific class feats or builds and just want an improvised action, I imagine it would be pretty safe to let the player roll 1 unarmed attack against the higher AC, then split the damage evenly between the two targets. That's already 3 MAP-inducing actions in one turn that all need to succeed, so even if it causes problems it's going to be hard to exploit.
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Grabbing someone well enough to apply the Grabbed condition requires a Grapple action.
Grabbing someone well enough to bump heads together can be part of an unarmed attack. No persistent condition applied, just the damage.
So if the character has no applicable feats and doesn't have the time or inclination to get any, I would allow two unarmed Strike actions, one on each enemy and with MAP applied normally. If both Strikes hit, they can flavor and describe it as grabbing them and smashing their heads together. And then releasing them since they haven't successfully grappled from a game mechanics perspective.