Proving partners settled status without passport - ILR (SET(M))

Wife's a US citizen imminently applying for ILR on the 5-year route to citizenship.

I am a British citizen from birth (born 1990) as are all my parents and their parents etc. (there's noone in living memory who wasn't).

I don't have a valid British passport (current one is expired). I need to otherwise prove that I am a British citizen and settled in the UK for my wife's application.

PLEASE DO NOT ADVISE ME TO RENEW/APPLY FOR A PASSPORT - I'VE ALREADY APPLIED TO RENEW IT BUT I NEED A SOLID PLAN B IF IT DOESN'T COME IN TIME

Currently I've assembled the following which I could submit as evidence of my status:

- My full birth certificate
- My driving licence (issued Oct 2021)
- 3 years of bank statements spaced 6 months between each
- Mum's full birth certificate
- Dad's short birth certificate
- Their marriage certificate (dated before I was born)
- Mum's current passport vignette
- Dad's current passport vignette
- My expired passport vignette (bearing in mind this is now with the Passport office for renewal)

Please could anyone advise on what I should or should not submit (as an alternative to a valid British passport), including any advise on whether a cover letter would be recommended and its content if so?

The online application advises:

If you are unable to provide your partner's travel document and your partner is a
British citizen, you must provide the full birth certificate for mjrmantastic showing
parents' names, accompanied by at least one other formal document as evidence of
ordinary residence in the UK for the last 3 years.

Evidence of ordinary residence for the last 3 years includes:
- notice of income tax coding
- driving licence
- building society
- savings books
- bank statements
- National Insurance or National Health Service registration issued by the
- Department for Work and Pensions or a local health authority

But I've been told that a birth certificate and driving licence (my original plan) would not be sufficient.

As I suggested in your other thread, you'll need the following:
- your birth certificate
- your parents' birth certificates (whatever format you have them in)
- your parents' marriage certificate
- evidence of ordinary residence in the UK for the last 3 years,  for which I would include:
1) your driving licence
And maybe 1 item of mail per year, for example:
1) Jan 2019 bank statement
2) Jan 2020 bank statement
3) Jan 2021 bank statement
4) Jan 2022 bank statement