I’m not sure my answer will be of much help because the potential assets we tried to nominate was up for sale. Therefore we applied to the Estate Agent for a viewing appointment. This allowed us to see which ones may or may not be suitable for what we wanted, which was like you a community space.
However if you are successful in the ACV nomination, as you have six weeks to register an interest once they notify you that the change of use, or sale, is happening, could you not nominate it anyway. That way it would not be pulled out from under you without notice once on the asset register. Could you also ask the council for advice on this too.
The place we wanted was turned down because it had been out of community use for more than two years so did not fit the criteria.
I hope this helps.