If you have a good set of airships and a good FC, you guys should have a solid amount of Tier IV materia. I regularly grab the people with the highest number of L60 DoH/DoL jobs in my FC and set about max-melding their gear.

And if all else fails, just SB i46 stuff. It's so crazy fast to do and you get loads of IIIs you can sell off if you don't need them, and the number of IVs you get in a few days of SBing should be enough to see you get your i150 gear max-melded. I know it's possible as it took me less than a week and I was gathering mats to craft my own HQ i46 DoH / DoL gear and got both sets completed in decent time. One week to SB enough stuff to max-meld your i150 gear isn't long at all, really, for the benefits you get out of it.

Specialist stuff is annoying. I'm hoping that there won't be too many or any that are too important... I like being self-sufficient but will make do with sharing the load with some other omnicrafters in the FC.

Really excited regardless, looks like DoH will actually have some use outside of catering to their own progression this patch.