May I recommend switching to vertical keyboard and mouse? Here https://geekhack.org/index.php?topic=79810.0 you can see my solution made from tripod parts and the Matias Ergo Pro which is a) mechanical b) split c) uses tripod screws. For vertical mice, the Evoluent VerticalMouse is fantastic and you can get previous generation (which are just as fine) used on eBay for $25-30.