I thought you can just use a sleeve on the front?
https://www.sjscycles.co.uk/hub-spares/halo-thru-axle-adaptor-sleeve-15-to-12-mm/
That's for using a 15mm hub with a 12mm fork. And even that does not always work. Not all forks have room for the wider end caps of a 15mm hub.
That octane has a 15mm fork.
@Jaap started
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I thought you can just use a sleeve on the front?
https://www.sjscycles.co.uk/hub-spares/halo-thru-axle-adaptor-sleeve-15-to-12-mm/