All is not lost.......
Get a 62.5/125 Simplex ST/ST cable assembly (local computer supply store should have them at no more than $20) and connect one end to your DAC ST connector and the other end inserted into the TOS connector. You can just gently push the ST center portion into the TOS connector. It will be a "snug" fit and should not fall out. Try this and you may be surprised
Let me know how you get on, regards, Richard