不可以把

Border Agency 網站說了：
If you have been naturalised as a British citizen since being given permission to settle in the UK, you should not apply for an NTL stamp - as a naturalised citizen, you have the right of abode in the UK and are no longer subject to immigration control. If you have also kept your other nationality and you want your British status to be confirmed in that passport, you should apply for a certificate of entitlement to right of abode. See Who has the right to live in the UK? for details.

http://www.ukba.homeoffice.gov.uk/while-in-uk/transfer-visa-to-passport/completing-form-NTL-TOC/

那就是說你入籍以後就不能再辦PR護照轉移了，所以這意思就是說英國官方認為你的PR已經作廢了。如果你不申請英國護照，隻用他國護照出國的話,Border Agency要求你先申請在他國護照上貼Certificate of Entitlement to Right of Abode, 證明你也是英國公民而且有回英國的權利：
http://www.ukba.homeoffice.gov.uk/britishcitizenship/righttoliveinuk/claimrightofabode/