No you won't be a restricted driver again, you do not have to display R plates after a re-testing. Also the only guideline there is for Northern Ireland is that you are to be banned for a minimum of 12 months. At the drink driving awareness course the lowest reading was 43 and the highest was 128 with a few of us having been involved in collisions and we all received 12 month bans reduced to 9 months for having completed the DD awareness course. We were all sentenced in either Newry or Armagh court for the 12 month bans, I have heard of Belfast court giving 18 month bans for high readings but with 65 I would expect 12 months. I blew 93 and got 12 months reduced to 9.
In regards to being struck off, I would tell your employer about your pending conviction sooner rather than later. Many jobs set out in the code of conduct that it is a disciplinary offence to not disclose ongoing criminal proceedings or a conviction. You would be surprised how many people are convicted of DD, you may find that it has no bearing on your job at all.