Using what Ranjit does as a basis they could actually make it work though the idea's you had lends it self better to a limited job because this would be "too complex" for normal play XD. And with yoshi-p being the producer for ff16 as well as clive having those abilities it could defiantly happen (God i hope it happens). If they were to make it a full job they could have it be like ranjit but instead you have multiple beasts you use in your rotation. The beasts work with the automiton queen a.i system so you want to wait till the last minute and activate the big move. After you activate the big move you transform (change gear like ranjit? idk) into the beast and do your combos in that form for a bit, maybe the form gives some special buff or something, until the end of that form to do a big attack again, change back and move on to the next beast. Could have it be random which beast you get of the 3 when you come out of the form but if you let the beast run out by itself without transforming it cycles to the next beast in line (Idk just spit balling an idea). I cant really think of a weapon they could use. I would say scythe while cool could go with something more original like a knife and a catalyst like rdms.