Context: Developing a Unity game which uses Rewired for controller input and Steam Remote Play for online play.

Objective: Distinguish between online (Remote Play) and local controller inputs for QOL reasons like extracting steam names for lobby or scoreboards.

Blockers:

1. Steam Remote Play API lacks direct access to controller data (e.g., DirectX ID) for controller identification.
2. Relying on player join order doe not provide reliable identification due to dynamic changes, such as 2 players joining, then the host assigning them controllers out of order, or controller swaps in general.

Attempted Solution: Implement a single mapped action in SteamInput (e.g., 'A' button press) and require players to press it multiple times in the lobby. Read the input from Rewired & Steam and determine sync based on input timing.

Question for the people smarter than me here:
1) Is this the best/only solution?
2) Does SteamInput API & SteamRemotePlayAPI have data in common to identify a link between them?

Being new to SteamInput specifically, I'm about to do a deep dive on (2) and I don't know if it's worth it. If I created a Steam input action map just for Start or A press, can I get any info on the keypress that could allow me to know if it belongs to a specific remote play controller? What if their are two players remote playing from the same session?