cheapest OSU! keypad possible

I want to play osu but don't have enough money for a simpad or smth, so I made this keypad from a cheap small PC mouse (it has PCB with 66x35mm size). I made 2 versions: with cable from the mouse itself (kp_solid_top.stl and kp_unified_bottom.stl are files) and version with mount for USB type C connector PCB (kp_type_c_top.stl and kp_unified_bottom.stl are files).

All you need is:
1) desolder mouse switches and red LED from mouse PCB
2) do some wires from PCB
3) buy 2 keyboard switches and solder them.
4) glue keypad parts together, then stick some rubber to the bottom
All is done, you did keypad for OSU just for 1 dollar)
I personally bought this mouse in local chop just under $1, but the cheapest AliExpress lot is about $2, here it is: https://aliexpress.ru/item/4001028973780.html
If you find a compatible mouse that will be cheaper pls share the link, I will post it here