Ah, Mojave accent color preference I see. Would it be possible to override BTT for purple since the warm orange doesn’t (or might not) “harmonise” with some others.
Using web-hosted videos might take too long to load, may not be smooth and might be hard for you to create new/update if I make and render for you, even if I send you the (AfterEffects, I think) files.
Another idea is that we could create sprite animations / image sequences of just the gesture indicator (e.g. the animated graphical dot for click, tap. force click and slide) which are stored in BTT. You also have blank images of the magic input devices.
With these resources, you can then overlay and position these assets over an input device. The dot/graphic itself would animate over the input device at your set position.
Essentially, you’d have something like animated stickers you stick onto the magic mouse/trackpad which change location/image as you wish.
If you make a new gesture or if new input device comes out, you can easily use these animated “stickers” for the new stuff.
Not sure if you understand, but this would be easy to edit and create new, it would be a smaller file size, easily editable and future proof at your side!