Forum Truth or Dare

You can always reach out to a contract manufacturer to populate certain components if the volume is enough.  Some smaller shops, especially if you can find one interested in audio, might be willing to do something at a reasonable price for a short run of boards.

Or there are quite a lot of hobby builders using toaster oven reflow or homemade hot air, though those can still be hit or miss with high precision stuff.  One of the hardest parts is if it has a ground pad on the bottom not just the edge lead pads that needs to be connected.