Which PLAYER and SPEAKER(S) to choose to play two files in parallel?

Question

Acustic systems

Friends! Not strong in modern gadgets, but I don’t know anything about sound-reproducing devices. I would be grateful for help.
Background:
I am a massage therapist. I visit clients at home. In addition to the massage table, I carry a bunch of junk with me. There's a lot of it and it's heavy.
I use a laptop as a device that plays the sound track of a massage session. It's also not the lightest. There is a desire to replace it with a player with mobile speakers.
What complicates the task.
During the session, two sound tracks are played simultaneously.
First: background music. Normal mp3s are played there. There are no special requirements for either bass or volume, since these are calm, quiet melodies or sounds of nature.
Second: functional sounds accompanying therapy. These are flac, wav files, the sound of which is critically important to reproduce accurately without compression and distortion.
The soundtracks are out of sync: they cannot be recorded into one audio file. You need to be able to start / stop / vary the volume of the tracks separately.
As far as I understand, the second sound track cannot be transmitted via bluetooth to speakers - bluetooth necessarily compresses sound files during transmission.
Then it turns out that there should be a pair of "player-speakers" connected by a wire.

Question 1: which player and which speakers should I choose for this pair? Let me remind you that it is important to play flac and wav without frequency distortion. Requires light weight and size. The task of minimizing the budget is worth it.
Question 2: are there players that can play two different audio files in parallel, or, conversely, speakers that can play sound from two sources at the same time? Or will you have to use two sound-reproducing devices and two pairs of speakers anyway?

Answer 1

Bluetooth does not compress sound!
Take a bluetooth speaker, for example JBL (cheap), Marshal (expensive)
As for the player, I'm not sure what will happen, but in theory. Take an android smartphone, there is an application in the market that can make "clones" of applications. And try to run there, for example, two VLC players ...
You can try a smartphone on Ubuntu ...
If not, buy a BU homeless nettop for 5-10k ... as an option
Well, or you can instead of a PC / smartphone - collect everything on RaspberryPI 4 ))))