Only you can answer that question. Obviously studying full-time, being around people who are doing the same course as you, having instant access to instructors if necessary and constantly being pushed to complete work on time is preferable to being left to get on with it. But only you can know how likely you are to be able to complete a distance learning course, how good you are at studying alone, how motivated you are to keep going when it all seems too much, and whether carrying on working is important enough to be worth the effort of doing a distance learning course. Some people are more capable of doing this than others. A small number of people actually claim to prefer distance learning, where they are not forced to study at the same speed as everyone else. We're all different.
As to your plan, it all sounds fine, except that there used to be a rule that whatever country issued your JAR PPL, all further JAR licenses must be issued by the same country. If you hold an Italian PPL, therefore, the CPL and ATPL would have to be issued by Italy (but not the IR, ME, etc etc etc, which are ratings and not licenses, and so can be done in any country). I think this rule has been relaxed, if not completely removed, recently, but I don't know the details - but it might be worth checking with either or both of the Italian and British CAA to check that your plan is ok with them before you go too much further.
FFF
---------------