A loud combo amp with a DI can carry a lot of stages, as long as the PA support is reliable and robust. Whether that's enough depends in part on the particular amp you've got and even moreso on the venues in the circuit you'll be playing.
If your band is all on in-ear monitors and you have PA support, the stage bass amp can be redundant. OTOH, if your bandmates are relying on your amp to supply the onstage bass pulse, you'll need enough amp to cover the gig if the venue's monitor system isn't designed to carry bass. And sometimes, the even the FOH PA in a ratty small venue won't be designed with bass in mind, so a robust stage rig can save the day.
Best to get the advice of a country player who knows the local/regional circuit. Or, you could start with a combo and move to something bigger only when you know you need it.
The only downsides of this approach are that you might develop a habit of digging in too much with your right hand, and you'll probably have at least one gig in which you won't be able to hear yourself well. (An amp stand is some insurance. Raising your cab closer to your ears won't help your bandmates lock in with the bass, but at least you'll be able to hear what you're doing.)