I, it is was my table, would first find out if a current SME 309 tonearm would fit the same mounting hole as the 3009. Then I would buy a used SME 309 arm to put on the same plinth in place of the 3009 you have now.
You would have an up-to-date TT with a great arm.
The arm used might be expensive.. (new it is $2,000) but your table would be 'HOT!' (nice!)