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pick up something like a Corne and a trackball. In the US you can get a barebones corne off Amazon/YMDK for around 60 bux, add some switches (akko usually has decent cheap stuff) and basic caps for a nice board easily under 100. As for trackballs - Elecom makes fine production models Id suggest the Huge or Deft Pro shapes. if you are up for some DIY get a Ploopy Classic2 or Mini. You will likely need to play with tenting the keyboard to get it where it doesnt hurt your hands. Heres what ive been using since fall last year for tenting; you can use a camera mount setup to tent stuff fairly cheaply compared to medical devices, this is what I used with my Sweep but should work fine with anything up to a Sofle or Lily58 easily. https://www.amazon.com/dp/B07Z5TNJX1 Camera mount plate, generic. pick one you like that fits the size you need, there are TONS of different shapes on amazon for cheap. Put some rubber feet/bumpons on the bottom so it doesn't slide around. https://www.amazon.com/dp/B07K84X662 Smallrig camera arms for adjusting your tent. these lock down nice and are firm, I didnt bother to try knockoffs since these were fairly cheap. https://www.amazon.com/dp/B0DP2TD5PP Magsafe mounts for camera bracket. id expect any of these would be fine. these were on sale when i bought them, id shop around for alternatives. fairly easy tenting solution that is adjustable, and comes apart in like 30sec so you can use it anywhere, and with any keyboard you can slap a magsafe ring/sticker on the back of.

if you havnt tented a board yet i recommend it. Here is a snippet from a previous post talking about my setup, for use with smaller splits - i use a Ferris Sweep. you can use a camera mount setup to tent stuff fairly cheaply compared to medical devices, this is what I used. https://www.amazon.com/dp/B07Z5TNJX1 Camera mount plate, generic. pick one you like that fits the size you need, there are TONS of different shapes on amazon for cheap. Put some rubber feet/bumpons on the bottom so it doesn't slide around. https://www.amazon.com/dp/B07K84X662 Smallrig camera arms for adjusting your tent. these lock down nice and are firm, I didnt bother to try knockoffs since these were fairly cheap. https://www.amazon.com/dp/B0DP2TD5PP Magsafe mounts for camera bracket. id expect any of these would be fine. these were on sale when i bought them, id shop around for alternatives. fairly easy tenting solution that is adjustable, and comes apart in like 30sec so you can use it anywhere, and with any keyboard you can slap a magsafe ring/sticker on the back of.