I would like to make a version for other Ponies if you have any suggestions for what would be the most fitting.

For Applejack I'm thinking the gunslinger knife.(It's the most country of all the knives)

Rainbow Dash the firebug knife. (Because it's already rainbow and the support knife was taken for a reference IDK if anyone will get)

Rarity the Commando Knife. (to go with the Rarity SCAR)

Pinkie either the Sharpshoother or Demo knife(Demo to go with the M32. Kurkri because its the weirdest and the most fun to say)