Combining these rules, here's another wild proposal from me.
1. imports should be part of the permanent roster, and should have no height limit, no matter the season format (whether 2-conference or full season format). Yes, I'd prefer if the All-Filipino were confined to the preseason or offseason. It should not be part of the regular year.
2. Change the Fil-foreigner limit to a FIBA-ineligible limit, and included in this list are imports and naturalized players as well as FIBA-ineligible Fil-foreigners. I'd prefer a limit of 5, but 7 is good also.
3. Each team can recruit a world import and an Asian import.
3a. In lieu of an Asian import, a team can opt for a naturalized player, or an import who had previously played at least 3-4 conferences.
It would be good if the PBA implements these rules, but it's highly unlikely.