If you need a bead jack to mount your tires, you had better have it with you when you get a flat or you are going to be stuck.
Another way to ease mounting of tires is to use a thinner rim strip than the usual Velox; I use Continental Easy Strips and others have used Kapton tape or reinforced filament packing tape. The thinner tape gives you more room to get the bead down into the rim, which gives you more slack.