Clear as mud
icarusone :
Did you apply for DEFO freighter ? If so then yes you can bid for any other freighter basing as they come open for bid. As you gain a little seniority it will not be a problem moving from one freighter basing to another.
If, on the other hand you are coming on board as a DEFO passanger then re-read Numero's post.
Or the abridged version is : most basings are either filled or will fill shortly. The bases will stay full until either the co. decides to add more based FO slots, or the pay packet goes up in Hong Kong !! It appears at the moment you can stay on a base as an FO and make the same money (or close enough that the agro won't make it worthwhile) as a HKG Captain but work hmmm about 11 days a month less !
Not to worry though, just get in now on the freighter and you can be check and training Captain within two years, and then you can have any base you want, you just can't have any leave !!
Roll on 65 !!!