Are you physically unable to start the older raids?
Once you have a raid unlocked, you can go back and run it at any time, when you have the tickets. The problem OP has is that nobody that is running o66 wants to lose out on the MK3 raid currency by running one of the other raids
This is why I like my guild - we normally run Endor, but we'd probably be fine if there was talk about running on older raid for fun. It sounds to me like the most practical course of action is for OP to ask his guildmates if they're alright with running one of the legacy raids once in a while, but I understand that the competitive guilds might not like that. I'm not sure how OP's guild works and if they'd be alright with that suggestion
This is why I like my guild - we normally run Endor,
I can't imagine choosing to miss out on the MK3 currency and staying somewhat competitive, but as long as you're happy, that's all that matters
We don't really have the teams for a guild-wide effort, though I'm working on some of my own
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