I already called him Malmierda weeks ago, so I am afraid no. Your version is too polite as well. Malmierda is better and more fitting than Malverde. Malmierda has that extra foul-smelling connotation.
Ernesta is the feminine version of Ernesto and covers the coward part of him as a manager and tactician.
Ernesta Malmierda is as good as it will get.
I see. All we need is a logo, a brand name, some money for advertising, a distribution network and we could make money of a puppet called Ernesta Malmierda. I reckon there's a possible market for those sort of stuff among Barca fans.
I'd pay to have an Ernesta Malmierda doll and do stuff with it like kicking it and tossing it around. Very good stress reliever. When anxious or nervous or stressed, just abuse Ernesta.
We can add some buttons. Like when you hit the head it says
Rakitic doesn't need rest. Or when you pull an arm it says
Suarez is the best. Or when you touch the nose it says
Coutinho and Dembele can't work together. Multilingual, of course. Chinese version, catalan version, english version.
Fuck it, considering how dumb Malmierda is you'd need several buttons on every limb and you'd still leave half of the great lines out.