All suggested DataVideo and Cypress (AVToolbox, TVone, others) do both PAL and NTSC. The DataVideo TBC-100 and TBC-1000 are auto-switching, while the others (3000, 4000, 7000) have internal DIP or jumper to control PAL/NTSC (and IRE).
Kramer FC-400 also has ability to convert between formats, though Avisynth/software conversion is always better quality (though with effort required, and some learning curve).
The only suggested TBC that is NTSC-only is the For.A FA-125. So avoid that one.
Good luck on your quest. The quality TBCs are scarce now. Mine all are gone or spoken for at the moment.
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