I remember reading interviews where Hooky explained why and how he finished Pictures in My Mind, mentioning how Ian told him that a song should never be left unfinished and that he believes it to this day. Shouldn't the same apply to Love Juice? I know the lyrics are crude, but the song itself sounds great IMO, and it would probably better than most songs in Lost Sirens.
Since finishing it with the rest of the band improbable, to say the least, I think Hooky could finish it with The Light. Not sure if fits his voice as well as Pictures, but I think he'd do fine.