Since the core is removable you could just get a normal length valve and use an extender ..
Is it? Wait, which valve has the removable core? I already have some core extenders.
its just a normal valve with this bit removable:
So you could have Tubeless vale > extender > valve core. Obviously it increases chances of leak etc. But if you know what you are doing and have plumbers tape at hand ..
@hippy started
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Since the core is removable you could just get a normal length valve and use an extender ..