Yeah, that might be the route in for him. There have been a number of suspect HOFs over the years, and even the recent HOF picks from Europe would not have been HOFers if they had spent their career in the NBA (with the possible exception of Petrovic, but he wasn't based on NBA work at the time he died). But there is a separate class of lesser talented HOFs that might be called just "firsts" -- composed of people who broke down barriers or invented new twists to the game. Might be Vlade's best shot. If he can claim any significant portion of credit for the flood of the best international players into the NBA, than he has been a very significant figure indeed and changed the game forever.
Be tough for him though, because having played his whole career opposite the great NBA centers, when it comes time to put him down as an inductee, I suspect many voters are going to ask how he can get in ahead of some of those other guys who were better than him head to head. However, I'm not sure if the rules dictate one international inductee a year or not, but that has been the pattern for a number of years now. So maybe through that device -- put him on a separate track from his NBA brethren to avoid the direct comparisons.