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Probably but it would be helpful to have the dates so we can check via ExpertFlyer (etc). But yes, you would need to call up for that, for which there is a potential telephone service charge, or you can book in O online and call within 24 hours to amend to N. Or you can call up.
In the past it was certainly possible to UuA from WT to CW on routes such as BEY which didn't offer WTP, but this being a special case I'm not so sure.