Based on what you have mentioned, farming conquest is extremely challenging (and close to impossible for certain teams). You can't do RBGs, in arenas 5v5 is dead and even if it wasn't only one or two comps are known to be viable. As Owl mentioned, doing random casuals will most likely spell failure for your group. The only possible thing I can imagine is to farm AV until you have full honor gear, then good luck winning random casuals enough number of times so you can eventually at some point have enough conquest points for gear. Since you will be doing it at a much slower rate than others, most will be fully geared way before you.

did I get that right?