As a fellow bikepacker, I'd strongly recommend going for a gravel bike. Not for the bolts (I only bolt on water bottle cages), but:
- Aero frames make 0 sense for bikepacking. As soon as you strap on bags, you lose whatever small advantage you could have gotten from an aero frame.
- Aero road bikes have a fit that's made for pro riders, not regular people. For long slow rides, you'll appreciate the comfortable fit of a gravel bike.
- When carrying bags, you'll want to fit some bigger tyres anyway, so you have more comfort and better puncture protection. For road bikepacking, I usually go for around 35mm.