There are a few things that would help.
1) sort the international calendar, (again), so that it is played in one block, radical, I know especially moving 6N, but this would help with international release.
2) create a 'future test schedule' to ensure T1 teams play T2 teams regularly over a set period.
2) strengthening the residency rules to include moving for work not pro rugby contract, including education.
3) WR to insist on international release for T2 players in club contract, maybe funding the insurance
4) SR and IPRC to be able to select PI players as 'local' players, so that the Comps become even better by the addition of quality players.