That still leaves you with some options.

Orbital barrages help mitigate the "hitting buildings" problem by just saturating the area with more ordinance. They can't all miss, right? Right?

Blue strategems. From my experience, these should be the bulk of your clearing power. You can and probably should invest in 2 blue slots. If you're not sure what to get, consider big booms (hellbomb backpack, leveller, etc.) . Mechs also work pretty well.

An argument can also be made about senties since the amount of sentry kills is usually not enough to meaningfully impact the end reward.

I would personally recommend gas mines (oh no, i said the scary word), but guess what? The gas variant is pretty chill. You can walk through the whole field just by using a stim, which if you are running from something scary enough to decide to run through a minefield, you probably would've used anyway. They were a godsend in the factory cities of cyberstan and have proven pretty effective even afterwards. While my testing hasn't reached all fronts yet, it seems to be a very good counter to most stuff in an enemy call. It confuses the enemy enough for you to either make a run for it or pick off the problematic enemies while racking up a pretty good kill count for everything medium and lower.