I believe Olle has a thread here [somewhere] about making a lanyard loop for a P38. That used a rectangular loop and required a bending block as well as stepped rod for the loop.
My Yugoslav M57/Zastava has a half-round lanyard loop, staked inside and looks like it is stepped too. Approx 2.5mm at the loop, you should be able to tell if your holes are smaller (means the rod is stepped).
The M57 is a similar copy of the TT33 with one extra round capacity & longer grip frame/grips/magazine. The M57 also has a captive recoil spring, much appreciated by disassemblers...
If you shoot it and you say you don't reload, then you should be able to sell the spent cartridges here as the C96 Mauser uses the same physical cartridge case...but with less powder...