I talked to Suzanne Bailey today. Fairly productive chat. So to answer some of the questions I raised.
Process takes 12 to 16 weeks.
A UCD Garda vetting policy is being worked on, not yet finalised.
Other UCD child protection policies are being updated as well.
There is no clear renewal date for vetting, 2 to 3 years is the likely renewal interval.
You can't be vetting unless you have being living in the country for the last 6 months.
ILAM are the governing body for sports complexes, setting standards and policies and so on. They do the Garda vetting for UCD sports clubs. ILAM write their own form and no PPS number is required. They only report back if there is a problem.
As far as I could work out ILAM approval to work for UCD is not transferable to other ILAM governed organisations.
Lastly, I couldn't figure out the criteria people are vetted against. So it seems the only certainty in the process is you must pass an undefined test.