a 3 card splash would be 3 cards that would not be getting their bonus -- ever. in that situation, under ELO rules, it is pretty safe to say that the answer is no
I attempted 5/3 splits with unfavorable results. Skeelz/Roots might manage 3 cards. Skeelz don't need their bonus in many situations and SoA counters are everywhere.
Come to think of it, a deck with 5 PC and 3 roots might work. PC have no elo playable 3*, but Roots have them in abundance.
I wouldn't consider 5/3 with this Clan Combo.
Especially Chiara Cr is not really needed when you Play All Stars.
And there were a few Roots the Last weeks. So you could Play this 3* with this stop ability...idk the name.