I don’t have a sublimation printer.Why not use sublimation and add a fabric cover. Some strechable material.
You might consider doing it in house. Pongs Silencio 5 is a Durable Acoustic Fabric for Latex printers, with profiles for the 300 Series on the media locator:Is there a good vender to source UV Printable Acoustic Panels? I have a potential job in a restaurant that asked if that something we can provide.