There is nothing wrong with praying the two sunnah rak’ahs following wudoo’ and entering ihraam after that, even if one does not usually do that
Question

                If a person does not usually pray two rak’ahs after doing wudoo’, can he pray them when he enters ihraam so that he may enter ihraam after doing that?.
Praise be to Allah.
    Yes, there is nothing wrong with praying them in order to 
    enter ihraam afterwards, so that one will be entering ihraam after praying. 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was 
    asked: You said that a person may enter ihraam after praying the Sunnah 
    prayer following wudoo’ if he usually prays it. But if he does not usually 
    do that but he offers this prayer, what is the ruling? 

    He replied: 

    I think that there is nothing wrong with it. If a person does 
    something, he does not have to do it all the time. So long as the Sunnah 
    prayer after wudoo’ is prescribed in sharee’ah and he wants to pray, there 
    is nothing wrong with it, and there is nothing wrong with it even if he 
    usually does not offer this prayer. End quote.

    Majmoo’ Fataawa Ibn ‘Uthaymeen 
    (22/14).