I am not going to dwell on your last statement except to say that it is common knowledge that several Recruiting Centres, have, in the past been guilty of this - not sure why - Suffice to say that our senior personnel are working in an attempt to correct this.
As for your other questions - NO, there is no signing bonuses for recruits. There is a provision to bring in HAL class EOOWs with potential signing bonuses but I have yet to see the documentation and know of no one who has been targetted - Obviously, this is a small group. What you likely heard was the talk of 'incentives'. Essentially, each year in a rank, on the anniversary date of your promotion, you recieve a cash incentive up to 4 years in rank at which time you should be promoted again (If not, you have p***ed in someone's Cornflakes and probably don't deserve a promotion!)
Unfortunately, your millright papers though beneficail, will likely excuse you from only small components of training. You will have a PLAR (Prior Learning Assessment) done which actually comes to one of the Schools (Esquimalt or Halifax) and people like myself look at the 'extra' education and compare it to the QSP (Qualification standard) for your trade course and determine if anything can be 'signed off'.
We have done a few of these recently for both stokers and electricians and the problem is though you may be excused for a phase of training, it may be short and then what do we do with you for that time period. Admittedly, this is a little outside my area but I would encourage you to wait and see what happens once you are in. Any extras you have will only enhance your ability to learn and move you along (in the short and long term) a little faster that the norm - in all likelihood.
Finally, and maybe nag is a little strong and maybe the Recruiter may have something to say to me offline but I encourage you to nag him/her to get the medical and final interview. The trade is woefully short at the junior levels and we truly need go getters like yourself - You are, after all, the Navy's future - Good Luck and keep plugging away!