It's possible to complete the full 11 week all-plays-all round robin schedule from the initial two weeks. Below there is an example which also has venue balance - no team more than twice in any single column.
Hope that helps.
Ian.
( 4 6) (11 12) ( 7 10) ( 5 9) ( 2 3) ( 1 8)
( 2 9) ( 7 12) ( 3 5) ( 1 11) ( 4 8) ( 6 10)
( 3 12) ( 1 6) ( 7 9) ( 8 11) ( 5 10) ( 2 4)
( 5 8) ( 2 11) ( 1 12) ( 4 10) ( 6 7) ( 3 9)
( 2 7) ( 9 10) ( 3 8) ( 4 12) ( 6 11) ( 1 5)
( 1 7) ( 2 5) ( 6 9) ( 8 12) ( 3 4) (10 11)
( 9 12) ( 5 6) ( 4 11) ( 3 7) ( 1 10) ( 2 8)
( 1 4) ( 3 10) ( 6 8) ( 5 7) ( 2 12) ( 9 11)
( 8 10) ( 4 9) ( 1 2) ( 3 6) ( 7 11) ( 5 12)
( 5 11) ( 1 3) (10 12) ( 2 6) ( 8 9) ( 4 7)
( 3 11) ( 7 8) ( 4 5) ( 2 10) ( 1 9) ( 6 12)