Hello Blue Whale, seems you have dodged all the harpoons so far. The site quoted in your text I think gives a simplification of the true facts e.g. the only difference is the pay scale, most of us would say that the difference is "the experience gained and more importantly needed"
It is true that a lot of us on this site are old codgers reliving the sea as we experienced it, when to become an AB meant going through some rigourous training and years served.
If it is so easy to become a seafarer in the good ole US of A why are you not considering that avenue, you are not very open about your reasons for wanting to experience life at sea with a base in the UK.
You will have noted that honesty and forthrightness seem to be the byewords on this site with no punches pulled, some have tried to help by guiding you to relevant sites but you are not helping us to help you by keeping your reasons close to your chest.
You will also have noted on this site, if you read the other forums, how the lads on this site go out of their way to help others, sometimes with little or no thanks for all the efforts they put in, are you one of those who is joining this latter group ? or are you of the modern world of me, me, me,