I think you're confused on what that business model is. I'm not bashing it, but I don't think many Spirit pilots understand based on the posts that I see.

The Ryanair model isn't just about a la carte pricing. Low labor cost is another integral part of the ULCC model. Looking at Ryanair pilots, they're all paid 30-40% less in total compensation than their European "legacy" counterparts, and at least 20% less than their LCC peers. It's one of the least desirable air carrier to work for and a place where you get your time in and get out. Attrition is upwards 70/month there (keeping the longevity low). Most employees are considered contract employees to skirt labor laws(including pilots). You pay for your own training, uniforms, no retirement, a mess of a "seniority system", no monthly guarantee (at least initially), FOs are typically 50-90K and CA tops out around 140K.
But hey, I think they're the ONLY european carrier with a minimum 4 days off between work blocks in their contract. Oh, and they're also the most profitable airline in Europe.

This is true of all their labor groups, and that is how they're able to grow to the second largest airline in Europe by passenger count, and 4th largest by fleet.

I think it's misguided for Spirit guys to look up to Ryanair as a business model to be proud of. I'm pretty sure your management team is doing everything they can to copy the success Ryan has had, including in the labor department. The difference I see between other management teams and Spirit is that the former is willing to pay or beat industry average (as long as it's not too much) in good times, Spirit, being true to itself as a ULCC, will never been willing to pay industry minus 20% unless there's a strike and the airline has shut down. And that is the main difference between Ryanair and Spirit. Ryanair pilots are contract employees based in many countries, there's not really a cohesive union whereas pilots in the US are unionized giving you guys at least a seat at the table.

If Spirit workgroups is able to attain industry average across the board for pilots, FAs, mechanics, agents, ground and operations personnel. People stayed and longevity/cost increased. It'll no longer be an ULCC carrier and will soon be replaced by Eastern, Braniff IV, etc.

There's no reason to not enjoy working at Spirit, but understand as a ULCC, fighting for industry average means you'll be striking in 3-5 years, start saving up, and the likely result of the strike will still be below industry average.

Good luck to y'all in negotiations.