I feel chest the most with deadstop dips, starting each rep from the bottom stretch. Basically this, but being tall enough to not need a box:
I accidentally discovered these when I realized there’s a dip bar at my gym that’s the perfect height for them. I walked over, grabbed the bar, and was automatically in bottom position standing flat-footed on the ground. Little fellas (I think the kids call them “manlets”) can use a step or some plates to get the same effect.
The shoulder stress is increased, but the chest activation is great enough to not need a ton of reps or a bunch of added load, especially if done later in the routine.
Also standing cable chest presses (I think doing them on a bench is too much time/energy setting up). All the benefits of dumbbells but a greater peak contraction and less shoulder stress since less weight is needed. Lastly, pec-deck flyes with 1-and-a-half reps, adding an extra half-ROM from mid-point to peak contraction for more chest work and less shoulder stress.