I think a few things are true.
1) you will be an attractive applicant with your RPN and OR certificate for Med Tech.
2) you will know much of the material on your QL3 and some of the material from your QL5A but there will still be a good amount of new stuff for you. It is exceedingly rare to have someone bypass the QL3, and I think it is a bad idea to bypass the QL3 as this is where you are brought into the medical family and have a common shared experience with your new mates. I would not try to get out of this training even some of it (likely the first 12 weeks, which is the clinical component) as this is the time time platoon grows together and you do not want to come in late as an outsider. Use your knowledge to help those that are struggling... there are always a few in the platoon and try and become the top student.
3) if you want to be an OR Tech you will have an easy time with the occupation transfer. There is some talk they are going to be getting rid of the mandatory 48 months you need as a Med Tech (in fact some seem to be doing it now in 36 months with only QL3) and will be able to join as a OR Tech from the street. I think someone said that this is still a few years away though. If you get accepted and want to be an OR Tech right away let people know as soon as you are done your QL3 Med Tech. Do not allow your RPN registration to expire, no matter what anyone tells you.
Good luck,
MC