I was recently in a trial for a different speeding offense, but I witnessed negotiations over a stunt driving charge. Not all of it applies to you but some of it might be helpful.
There was a paralegal (or lawyer) representing someone who had been pulled over for 155 in a 100 zone. This driver hadn't had a charge in 7 years, 7 years ago had a conviction for 29 over. The officer had reduced the ticket to 39 over at roadside. The defendant was not present and sent the paralegal with instructions to negotiate for 29 over or schedule a new trial date, but to the disgust of the prosecutor and officers present (they were making jokes like "Oh, the officer's here! Better reschedule the trial and try again!"). Anyway, after about 5 minutes of negotiations (read: grovelling by the paralegal) the paralegal was able to get the charge reduced further to 29 over. Note that the prosecutor absolutely would not have done this on his own, this was done once the paralegal was able to convince the officer that she would impress on the defendant the severity of the penalties for the original charge, and the prosecutor deferred to the officer's decision.
If any part of the above is relevant for you, it's the possibility that the officer may agree that a plea bargain to a lower charge is acceptable if you are remorseful (read: your paralegal/lawyer convincingly says you are remorseful and understand how severe the charge is) and if the officer agrees, the prosecutor likely will too.
As for what the insurance costs would be, I recommend to go on auto insurance websites, put in information that mostly matches yours (same postal code - different address, same age, same date of getting licence etc) with a 0-49 over charge, and with a 50+ over charge, and see what the differences in insurance are. This, along with your lawyer/paralegal's advice, will help you decide if it's worth it to plead to a charge of 49 over if possible, or fight the charge.
For your information, from an insurance perspective there is no difference between a speeding conviction 1km/hr over and 49km/hr over. Both carry the same insurance hike (if any). From a demerit point perspective the brackets are: 0-15km over is 0 points, 16-29km over is 3, 30-49 is 4. I'm not current on how many demerit points a young G2 driver can carry before risk of license suspension, but the points aren't generally relevant unless you get convicted of multiple offenses, so as long as you don't repeat the mistake I wouldn't worry about 3 vs 4 demerit points.
I'll end with a bit of good news: After 3 years, the charge will no longer show up on your insurance or driver's abstract. So it won't affect your long term employment prospects, except with the police (as the police and courts can see your entire history of convictions).