Non-US founders filing 83(b) without SSN/ITIN: how did you handle it? [I will not promote]

I’m a non-US founder / non-US tax resident receiving restricted founder stock in a Delaware C-Corp. The shares are subject to vesting, so I’m planning to file an 83(b) election protectively in case I later join a US accelerator, or raise from US investors. The issue is that I don’t have a US SSN or ITIN. For founders who were in a similar situation: Did you file the 83(b) without an SSN/ITIN? What did you put in the TIN field: “N/A”, “Foreign Individual”, “Nonresident”, “Applied For”, or something else? Did