If you're asking, "Will the Orthodox Church either condemn or commend a non-Orthodox (specifically Protestant) Christian who undertakes obvious non-Protestant but clearly Orthodox practices?" the answer is "No". The Church won't make those sorts of judgements for those outside the Church.
If you're asking for personal opinions about these things, you'll get a variety of answers to choose from
My opinion: if the Protestant is truly seeking to be as fully Christian as possible, then I do believe that God will honour that effort. If the Protestant is just thinking, "That looks like fun. I think I'll try it" then what's the point? If the Protestant wants to act
Orthodox without being
Orthodox, it's probably something of a waste of time as there's little if any sincerity there. Either you're Orthodox or you're not. So I would encourage any who believe that Orthodox practices will draw them into a closer relationship with God (as a Protestant might say it) that they seriously look at the Orthodox Church. Then we will affirm that those practices will be for the benefit of the believer and those around him.