Issues with Xinput IDs

[Hemi-Cuda]

Encountered a weird issue with my retro gaming box (a Minisforum UM773). It's set to launch Bigbox at startup which works fine, and if I connect my bluetooth controller (either an Xbox One controller or 8bitdo Pro 2)  after Bigbox is running there are no issues. But if I connect the controller right when Windows loads and before Bigbox is running, then things get messed up. Normally the first controller I connect get assigned to Xinput-0, and that's what my PCSX2 and Dolphin P1 controllers are bound to. But apparently if I'm too fast on connecting the controller and it connects before Bigbox loads, then it gets assigned Xinput-1 and neither PCSX2 or Dolphin will recognize it as P1. Anyone else encountered this and might know how to force the first controller to always use Xinput-0 regardless of when it connects? It's not a big deal for myself, but when my kids try to play they usually turn the controllers on as soon as they start the system, which is a problem if they try to play any PS2 or Gamecube games