Travel to Italy from the UK

With the recent changes in UK rules and the amount of tests I have to take growing, I thought it would be best to get a second opinion on what I've planned:

• I am flying from Stansted to Treviso (Venice) on 12th December with Ryanair
• I am returning on the 15th December, also with Ryan air
• I am staying in Venice full time with my partner, we are both fully vaccinated

Regarding covid:

1. I have paid for Test to Return antigen test and a Day 2 PCR test with an approved gov.uk partner for both of us.
2. We have both filled out the Italian registration form.
3. We will fill out Passenger Locator Form 48 hours before we enter the UK (and take our test to return at the same time).
4. Self isolate until the Day 2 PCR test comes back negative.
5. We also both have the NHS covid passport/QR through the NHS app.

I know I need to present to Ryanair a negative LFT/PCR test before departing the UK. But on all the Italian guidance nothing says it needs to be a "fit for travel" test, so can I present any lateral flow test (e.g. NHS one, since I take them multiple times a week anyway) or will Ryanair/Italy deny me entry for not having fit for travel test?

Is there anything else I need to know or do? I know the UK is on Italy's List D - which requires a negative test 48 hours before entry and proof of a full vaccine history.