The West Coast Classic was a COVID thing, not a "there's no NBL1 agreement yet" thing. A normal SBL season was a week or two away from starting when things shut down. They had to go to a new format because they had less time in which to play the season, and because signing and recruiting imports on such short notice wasn't going to be viable.
Unless there's another outbreak, I can't imagine it won't be business as usual, whether that's SBL as in the past or whether it's NBL1.
Imports not in the State - almost certainly not going to be allowed. Imports from America will be difficult to get in with the (federal) border not likley to open before mid next year
Why would they be any harder to get in than imports in the NBL, which are clearly not a problem?