No need to try as it already exists: Any Linux tablet with Reaper and a couple soft synths and a decent external sound card if needed would do a lot more for a lot less. A good portion of the cost of this device could be justified only if it really had motorized knobs and faders, which are shown in the video but not mentioned among the features; that would be a completely unnecessary gimmick (in such a device) which however would impact a lot on the cost.
Portable music devices aren't that expensive these days. Take a look at what SunVox can do on old hardware, or maybe the Polyend Tracker, which is a hardware solution that costs less than half of the tx-6 and doesn't kill the eyes on a toy display.