I don't think this is possible I know that some people have tried it but no one have succeed it.
And it isn't supported be the devs, because it would take to long before it's fully afk and there aren't that many people that are interested in this.
the best thing is what you could do is play with your tank (or just do the movement) and let the rest follow you with a raiding botbase
Actually, the default dungeonbuddy scripts are very good in general!
Yes, they do not support tanking, so you need to have some nice multiboxing skills and/or experience to control the 2x tank if needed, but ~10 SOO NM/Flex bosses are not hard to be done. In some encounters, the healing is not easy task, so you need unusual raid setup, but if you over-gear the content, you have better chances to do it successfully
And yes, some certain people in the forum have done it before. Just use the search function if you are interested, I even read that some people do solo boost random buyers in SOO Flex.
Myself had tried with 6x characters last month, but wiped on Immersius Flex after 4th switch, had not enough accounts to test a full raid at that time.
But since then I do successfully run Normal/Flex raids with Dungeonbuddy, yes they are 90% monitored, but 98% AFK.
Got spotted by a random only once on a resto druid, but only because we were waiting for tanks on Galakras for 30min, and someone noticed, that Singular instant hot players, jumping from the towers for fun.
That way I geared some of my gather bots to the funny 565-570ilvl, with 95%+ AFK.