yeah, even w/o Atma THF treasure hunter works. Also did you finish any storylines? If you did you can probably get some synthetic atma,
some of them are pretty good, better than nothing.
I'd say your first goal should be to do some Mega Bosses and get some atma. Even just one or two, that way when your WAR is abyssea level you'll be ready to help out.
People are generally pretty decent about letting people join for atma. I know my LS has let a lot of people join up for the atma drop - so it could be worthwhile just going to where the mobs that drop the atma you want spawn and politely asking anyone who is doing them if you can have the atma. Also put it in your seacom when you are in the zone.
When it comes to sitting around not doing anything for long periods of time, only being active for short windows, and marginal changes and sidegrades I'd say FFXI players were the perfect choice for politicians.