Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 2 months ago

Tayammum instead of Ghusl is allowed only if Ghusl is not possible e.g. no water, no enough time, health reason preventing Ghusl, etc. 

Convenience alone is not a valid reason to leave Ghusl and do Tayammum in stead of it. Ghusl remains obligatory because it is possible even with little difficulty, and in such case Tayammum will be invalid.