Let's do some basic math here... U r 41 now, takes at least 2 years to get to AE entry level if you are really up to speed and doing it full time, so 43/44 the earliest, if they r still hiring AE cadets at that time... Then almost another year before u finish Adelaide and start working, 45 the earliest... What makes you think CX would pay for your training instead for someone 20+ years younger than you? That's 20 more years of service (hopefully) for them to regain their cost, let alone the risk of you losing your medical before 65...
While I admire your dedication and will to chase your dreams, reality is you probably have missed the boat by at least 10 years. Sorry to be blunt but unless you have billions saved up and could literally not work for a single day again for the rest of your life, it's probably not a wise decision for your wife and kids. I believe there were cadets who were close to 40 when they joined but they were either single or no kids.