If you have confidence in the payer, and if you know (as you appear to) that you know the amount involved from an income point of view, I would just file and extension and make a payment based on the assumption of what your tax will be.
This means that you will have until October 15, 2024 to recover and to file the correct return. Much simpler than the 4852.
It's hard to tell what the IRS scrutinizes, but why invite trouble with forms that you are not familiar with.
If you are confident of what will be on that 1099-R, just file the extension and put all your energy into healing.
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