Public servant on pre 2013 pension: should I resign and apply for a new role with single service scheme

I'm 50 and single. I pay over 12,000 euro per year into my public service pension - I'm on the pre-2013 scheme. My colleague on the same grade as me pays much less into their pension because they are on the single scheme. I do not own a home and I'd like to buy a home soon or before I retire. Should I change to the single service scheme to give me more purchasing power to buy a home now? I think this would require me to resign and stay off work for 6 months before starting a new public service job.
Also, am I right in thinking that the value of my pension is being reduced because of state pension increases?

The contributions to the SPSPS are lower as the benefits are generally less.

This is because it is based on career-average earnings, not final earnings.

That's not necessarily true and it appears to me that people in similar situations to mine are worse off on the old scheme.
E.g. Grade 8/AP or equivalent who worked part time for years and who will not have full service, compared to new entrant who will have the same years service on retirement (25 years) and will retire with the same benefits but who paid 7% less in AVC over the years.

See here fora good explanation: https://www.askaboutmoney.com/threa...e-public-service-pension-scheme-spsps.225922/

Is there a clever person who could do a calculation?

I'm surprised at this.

Surely the unions would object to the pre-2013 staff paying much more ASC, and not getting more benefits?