I would not pursue the cabin crew career, choose something else, cruise ships, hospitality maybe, because if you shine a spotlight on your previous employment then all will be revealed. We all make mistakes, we all have been there. If you want to be a pilot then go hard at that, and success goes to those who never give up. Hide this once-off mistake. Bury it as part of your past. As L.P. Hartley once wrote "The past is a foreign country - they do things differently there." I know an airbus check and training captain who drank way too much on an overnight when he was a beech 1900 F/O and I (the captain) had to cover for him and perform half his duties the next day. He apologised profusely at the end of the shift, which was accepted. Just imagine what a crap world it would be if everyone knew everyone else's shortcomings. I could have had him sacked. Retribution is for the petty-minded and talentless. When you get your flying job my advice is (and I've passed this on to many F/Os) :
1. Always look the part, shirt perfectly ironed, hair well groomed and NOT "fashionable" without gel that makes you look like "Something about Mary"
2. Fly better than anyone else. Be so far in front of the aircraft that you are thinking about the flavour of coffee you're going to order at destination before top of climb.
3. At work, never, ever lie. If you are clueless the words are "I don't know". Mis-information is extremely damaging, so read "Gullivers Travels" to get a grip.
At the moment you are trying to fall back on the familiar to support your voyage into the unknown. That's a step backwards. I've been a hirer and firer, I'd give you a shot but you'd have to do a bloody good sim, and your skills won't get better in the cabin.
For what it's worth, good luck!
Ned