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

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).