I made this keyboard tray to complement my HID Relay USB Keyboard->Bluetooth Keyboard mod. It was designed to fit my TeamWolf Zhuque+, but should accomodate any keyboard up to 350mm wide by 117mm deep with the cable centered from the back.
Probably nobody else needs such a niche item, but I thought I'd share anyway.
If you're more interested in the USB->Bluetooth adapter, check out my videos on how it works and build instructions here: https://www.youtube.com/playlist?list=PLVfmdw6Y3COp4Via7KergjVs8i194ffJS
If you want to print the split version, print the tab and slot test files first to test the separation tolerance and tweak your slicer/print settings if needed.
The split parts are designed to fit on my Bukito's 140x150mm print bed. You need support under the tabs. I printed with only 10% infill, 3 perimeters, and 3 layers top/bottom.
You'll probably want a denser infill and/or more top layers to avoid some holes that I got around the inside walls where the keyboard sits. The keyboard will be covering it up, but if that still bugs you adjust settings accordingly.