You have other methods of reaching a climb-proof base, most notably since sorcery came out:

• Bat Demon, but you need to be corrupted enough to cast that spell, and have the reagent on you.
• Frozen Bridge, just need to find the right spot to reach, and need reagent of course.
• Catapulting yourself with a Trebuchet + an optional Slow Fall spell.

Still, I agree we could use a few other options than just the elevators when it comes to building.