It doesnt have to be an exact replica. As long as the internal is the same shape but marginally larger than the tube profile so the pressure is evenly distributed. I would definitely start looking into it, you don't know how long Look/Zyro will keep delaying for
I've emailed Look to have a CAD file for this seatmast so I can pass it down to Matt for him to build it for me, but there is no response yet.