part of your question regarding conversion is a fairly standard one so i do recommend searching a bit on the forums.
http://www.pprune.org/professional-p...ml#post7250062
opionions on conversions vary.
my personal opionion is that - unless you have a good amount of money, time and willngness to take a risk - converting to a european license is not a very worthwhile venture. (especially if you only speak english and no other european language.)
the issue is your flight experience after a conversion. (in europe, can not speak for australia etc).
hiring often (NOT ALWAYS) works through an integrated course doing the whole thing or getting recruited with a Type rating (and mabye even 500 hrs on type).
im not saying that inbetween is impossible but just harder.
before you decide, check out where you would be after any conversion and what job options you have then.
best of luck