The bottom line is that you would submit Form 8453 only with one of the forms listed on Form 8453 (the election is not one of them). The form you would submit with Form 8453 is Form 3115, but you would not submit that form prior to the making the election.
I suggest that you read through Rev. Proc. 2018-31 as it is authoritative.
See Page 94: https://www.irs.gov/pub/irs-drop/rp-18-31.pdf
Also, take a look at the following link for a quick summary of the procedure. Again, according to the instructions, the election must be made by attaching a statement to your 2018 return or to a request for an extension (Form 4868).
http://www.tradelogsoftware.com/resources/mark-to-market-form-4797/#mtm-how
