(I'm a bit puzzled by why you'd want to call yourself a Marxist at all. It hardly carries a single positive implication outside of the ivory towers of leftist academia (though I'll grant you that it can be something of a free pass there).
Well, I generally
don't, at least these days, it's just a label that's stuck round here. It's not even an objection to the connotations, I just don't think that the term actually communicates my thinking in any effective way. ("Marxian", mebbe, but that's almost deliberately nebulous as a label.) Probably my own fault, these things usually are, but at this point it's something that I suffer rather than embrace.
Also, isn't there something rather anti-egalitarian - and perhaps even a little cultish - about raising one rather wealthy intellectual to such an exalted position in our social discourse as Marxists do with Marx?)
To be honest, I can see where you're coming from. A lot of Marxists do a really sloppy of job of making a distinction between Marxian thinking and Marxology, which leads them to simultaneously invoke Marx as some sort of prophet, and to impose their own particular revisions or expansions of Marx's thought onto Marx himself. Down that road, as you're doubtlessly aware, madness lies.
However, I don't think that there's any harm in identifying Marx is a singular powerful social thinker, provided that you keep a level head about it. Plenty of folk working in the Marxian tradition can and do add in elements from non-Marxian traditions like anarchism or feminism, or from non-Marxist and even anti-Marxist thinkers like Weber, Nietzsche and Heidegger. These days, the only people you'll find even
claiming an undiluted Marxism are living relics like the Sparts or the ICT, and they are quite frankly a bunch of complete weirdos.
I mean, in practice, I'm no more beholden to Marx than the average liberal is to Locke, Rousseau and Mill. I'm just explicit about it.