I recently had a situation where I ordered a sefardi sefer torah and the sofer left only a few letters to be filled in by the shul. the shul wants more for donors and want to know if i can scratch out some letters, to be filled in at the siyum .
The sefer has osiyos nifsakim at the end, not osiyos challalim, so the sefer is definitely NOT kosher. Furthermore the yeriyos are not sewn together yet, so it is a work in progress. Question is, can one make more small nifsakim to accommodate the extra donors? Obviously hashems name cannot be touched but what about some other words / letters?