I hope it goes well for you, but I agree that the watchtower holds people hostage in these situations. My son was Dfd when he got married. I was not supposed to attend according to the elders. At the last minute, I got dressed and went anyway. The smile on his face when he saw me there and the huge hug he gave me afterwards was worth any 'RISK' of losing favor with the smug, uncaring jws.
Do invite your parents sincerely and remind them it is really special for them to share this with you. I know that's putting yourself out there emotionally, but hopefully it will stir that natural love that is being stifled by the jws.
Best wishes and congratulations!
choosing life