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Could do that. Threadless top cup, spacers, locknut on the thread.
Only problem odd the locknut won’t lock against a threadless top cup. Two locknuts tightened against each other could work.
Be aware though that the lock nuts usually have a lip which will prevent them threading right down the steerer, this can be filed away though.
Threads can be extended but it's tough work and can be hard on tools so expect to pay a fair bit to have it done.