You are not going to get an advantage on anything but what you already have but if SDVI decided to make a new offer, they can set the conversion wherever they want. Whether or not the new conversion would have a restricted legend, I do not know. If yours do not, that is your advantage. Dividends are generally restricted for 6-12 months so I would guess no free trading conversion will be taking place pre or post IPO, whenever that happens. If one is offered and they are restricted, it better be a good deal.
IMO