Kai? He is in jail for murder I think.

I can't find an off the shelf tool for that. Pedro's universal crank puller has an 8mm built in and the handle is removable leaving a larger hex for a wrench. Not sure if that is a 15mm hex head though.

The Park Tool CCW-5 might work too. The 8mm allen/14mm socket part can be somewhat easily knocked out of the handle and carried alone. I can't remember what size the remaining big hex is.

Run over to your LBS and measure up either of those.