I think if they did, it would have to be for a very specific kind of knife.
The Thresher, Crux, and Perpetua are the only current Drop knives that stand out to me as possibly worth a trainer version. Off the top of my head anyway.
The Crux because it's a great overall package, the lockbar is sturdy as all hell, and the blade/handle profile would be compatible enough with an emergency weapon role. It's narrow enough and strong enough to do thrusting things without the concerns I would have with a framelock that has a light as possible lockbar.
The Thresher doesn't have the same overbuilt lockbar, but its larger size and pointy/strong/big bellied blade profile would be nice features in the role, the size especially might make it more comfortable for some people to use while shaking with adrenaline.
The Perpetua is an Axis lock and like the Crux, it's a great size format for a working/EDC knife that the owner happens to train with. Axis locks are super and the lockup tends to react to stress by getting more secure until the force is so extreme that you can deform the liners. Plus it's on the lower end of the cost scale, like the Crux, making it a reasonable prospect for a trainer model. The Reate made knives didn't even get considered for cost reasons.
Oh I forgot the Bradford Guardian 3.5, it's a little fixed blade with a great secure handle, and so it would be the easiest/best suited out of all the Drop knives for a trainer.