I am asking you where you got this idea that catechumens are members of the Orthodox church.
Well, bishops, for one. I've spoken to many.
They get a funeral if they die before they are baptised, so there's that. The funeral is not "one of the seven sacraments" (a Latin innovation, as I'm sure I don't need to tell you...), but it has not infrequently been treated as a sacrament in the larger tradition of the Church, and it's not like they're given out freely to visitors like antidoron. I did my M.Div. thesis on funeral rites in the Orthodox Church, so I know something about those, as the degree-granting faculty will vouch if challenged.
Catechumens are allowed to attend the Liturgy in the nave until their dismissal, at which point various traditions exist for what they do (e.g., stand outside the doors in the narthex and pray, go home, etc.). Traditionally, you wouldn't be allowed to enter the nave if you were just some guy off the street who was interested in esoteric Christian art (let alone the nave for the Liturgy) because there was a porter or subdeacon to watch the doors, so that's another thing. "The doors, the doors" isn't just a cool thing to say. It means something.
And that's beside the fact that there's the prickly problem of what to do about "catechumens" who are going to be received by some form of economy because their previous baptisms (and/or chrismation, if applicable) are deemed acceptable. Can you be a catechumen if you are baptised? Perhaps you want to stand by the commonly held belief that "economy fills the grace that is lacking in the heterodox shell of a sacrament", but that alone won't get you across the finish line unless you ignore history.
What's your reason for holding to the idea that catechumens are not members of the Church? Edited to take out a double negative.