Sorry but these ideas are just non-starters.
Training crafting skills for weeks/months and resetting that time spent is not only pointless, it's a huge blow to people who ONLY craft.
Yes there are people who will buy 1 account and will ONLY craft.
You're going to have to accept the fact that guilds will use all available tools to get ahead. It is part of the MMO experience and shouldn't be looked at as a negative.
Looking at the long term, all guilds will eventually catch up. You also have to consider that you can buy crafted gear, bypassing the need for dedicated crafters.
Also full loot campaigns... ya this isn't as big an issue as OP is imagining.