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MCamb
Ones which don't exist 🙂
There are plenty of 15×100 to 9×100 converters available because people wanted to put new wheels in common old forks. Your problem is that 9×110 is not common, yours is the first one I've come across. Boost hubs were designed to go in through-axle forks, and there were no legacy forks they'd go into even if there was a conversion axle since the disc line is not the same as old 9×100 and 20×110 hubs. All the 9mm through axles which might be the starting point for an alternative to a skinny 5mm skewer have the same problem as the skewers, they are designed for 100mm OLN hubs and will be too short for you. I have one in my bag of axle spares, and the maximum it could cover is 116mm over the outside of the fork ends.
In principle, the conversion kit I used was a tube, a length of studding and two track nuts. The last of these you can easily buy, but M9×1.0 studding is not anybody's idea of a stock item and again M9 front track hub axles are designed for 100mm OLN and won't stretch the extra 10mm.
You can buy M9×1.0 screws, so the bare minimum custom solution is a 14.9×109.5 rod with M9 female threads in each end, or the same with M9 male extensions each end to accept OTP track nuts.