Yes, if the president of Syria plays his cards right, and had great communication skills, which he can easily be taught, he can get western nations to side with his regime. It all depends on how he presents his side, and how good he can debate his issue to them.
Assad will never get the support of Western nations because he is responsible for war crimes against his own people. No Western leader wants to be associated with him. Although the West does not support all of the rebels either, Assad is never going to get support from America or Europe.
I do not believe Bashar Assad will be able to persuade western nations to side with his regime. I believe this is clear because the western nations have been calling for his resignation given his reaction to the Arab Spring events. It is doubtful western nations will do a complete turn around.
No, Bashar Assad cannot persuade western nations to side with his regime, because his regime appears to have been responsible for many terrible things. Assad has not been able to control his country. There is terrible civil war there, along with genocide, and Assad has not been able to prevent this. He is not worthy of having us on his side.
There is no logical way that I can think of that Bashar Assad persuade western nations to side with his regime. The leader of Syria has repeatedly lied about war crimes and his treatment of Syrian citizens. No western nation would ever support someone with such a poor record of human rights.