Multitool for track nuts

Hello,

Last weekend I lost my faithful companion multitool when I forgot to zip my seatpack up properly after a getting something out so I went out to get a replacement. The problem I have though is I have track nuts on the bike in question (for wheel security when commuting) and while my old multitool had a tool to remove them the new ones all seem to be of the super-penknife folding design that is full of Allen keys and screwdrivers but no spanners. I've found one that at least has an 8mm and 10mm spanner for the other nuts on the bike but not a 15mm one for the track nuts. Anyone got any suggestions other than carrying a separate spanner. And how do others manage when its a nut, not a bolt, that needs undoing?

Please help

I didn't find the right solution from the internet.

References:

https://forum.cyclinguk.org/viewtopic.php?t=89084

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Thanks