Not sure how much sim time the CRM course includes.
In the past Jet2 have only accepted any JOC which includes minimum 16hrs sim time, the current recruitment ad states that it needs to be a 16hrs JOC. I assume that by this they mean 16hrs sim time and not 16hrs total sim and classroom time. You might want to email the recruitment address to confirm this before committing to spending money and time on a course that might not be sufficient.
There are plenty of JOCs that include less than 16hrs sim but not a lot of that include 16hrs or more sim time, in the UK I think OAA has sufficient time and if you’ve got the CTC AQC course then they’ll accept that.
I notice that your location is Italy, I’m sorry but I have no idea about JOC courses in Italy. If you’re currently in Italy then I’m confident that you can find somewhere close to home that will have a 16hr sim JOC without having to come to UK.