Theorycrafting - Turn FF6 into FF4?

I'm not sure if this has been done before so maybe I'm just retreading old ground, but - would it be possible to remake FF4 in FF6?

FF6 has two world maps that could be the main world and the underground, and maybe the Serpent Trench map could be turned into the moon? It has enough character slots (FF4 has twelve characters including the two versions of Cecil, plus Golbez at the end of the game as a guest). The mechanic of bosses taking on alternate forms (the Four Fiends, for instance) could possibly be achieved with clever sprite design - like, maybe make Cagnazzo's water aura he summons a separate enemy, and when he "summons the water", make that enemy appear, designed to appear over him, and make it untargetable and invisible so it is just a visual effect, and then remove the enemy from battle when the aura is dispersed. Dunno if that would work but it might?

Battle mechanics, major hurdle would be Mini, Pig, and Toad - we have the Imp spell, maybe we could duplicate its effects three times? We'd have Umaro and Gogo's sprite sheets to spare, after all. Maybe Condemn's mechanics could be duplicated for Gradual Petrify? We'd also need to implement Curse and Paralyze statuses, but I don't imagine that would be difficult. 

For character abilities, the only hurdle would be giving everyone a level up list of Magic they could learn, but if that could be achieved the rest wouldn't be hard, we can just fold Magic into one command list (there are 24 spells each Black Magic and White Magic, FF6 has plenty of room). Lore could be turned into Summon for Rydia, Kain would of course have Jump, Edge can have Steal and Throw (he'd lose Ninjutsu, but FF6's Scrolls are more or less the same thing and cover 4/6 of Edge's Ninjutsu, leaving out Smoke and Shadowbind; if Inviz Edge could be turned into a Shadowbind effect and Smoke Bomb turned into a Throw item, we'd set). Fusoya can have Pray. 

Shock could be retooled as Cecil's Dark Wave, and if we could duplicate Shock's coding into other ability slots, that could be used to create Yang's Kick,  Cid's Scan, and Porom's Cry. Or, if we want to be more creative, we could give Yang and Cid Blitz and Tools wholesale and come up with something new for Porom. Edward could just drop Hide and we turn Magitek into a Bardsong menu. Salve, I dunno if that could be duplicated, but we could get creative again and give Edward Gil Toss. Runic could probably be turned into Cover and we could give Cecil permanent Cover status ala Interceptor. Tellah's Recall could be adapted into Slots with the graphics changed to various spell effects, or given that we have both Rage and Dance to work off of, maybe we could actually create Recall as a command that uses a random ability from a predetermined pool. The abilities I'm not sure if they could be adapted are Rosa's Aim (leave Pray to Fusoya and drop it from her), Yang's Focus (we could just drop Brace), Palom's Bluff, and Twincast. But overall that's most of them that would be feasible.

Of course, the final major hurdle would be changing the battle system to accomodate a party of five characters, and THAT would probably be a lot of work, if it's even possible.

I'm not actually doing this, like the thread title says just theorycrafting if it could be done.