I have a F1 visa OPT application pending under 221G visa mantis at a US embassy. My STEM OPT is valid until Aug 2015. It is likely that the admin process background check on my visa application only starts around april 1st. I consulted with a lawyer who suggested that my company file for H1B, but donot file for change of status. He says that having a H1B application filed at USCIS will not be an issue for getting a F1 visa. I have an option of applying next year as well.
Also, let say H1B is filed, how late can I delay transitioning to H1B? I would prefer to stay on STEM OPT work authorization. I understand that without filing for COS, I will need to exit US and apply for H1B visa.