When the people of the Church go into diaspora they fall into the danger of losing their faith, losing contact with the Church, and converting to other groups. The Church needs to follow them and tend to their spiritual needs so this doesn't happen. If you are a Copt in a foreign land, the Coptic Church is not going to be able to do this if it makes itself as foreign and non-Coptic as the local Lutheran Church.
The Oriental Orthodox have gone into diaspora much more recently than other Christian peoples. Many are grappling with adjusting to a new language and culture, and the only place where they feel truly at home is their church, where they can hear their language spoken, eat their own foods and be comfortable in their own culture. The Church needs to provide this for them in diaspora so as not to lose them. They need to be in a comfortable, "safe," place to feel at home to worship God in the way they were raised.
Making the Church over in a way that will make it alien to the people it followed will keep it from being able to adequately serve them. I can tell you with certainty that if the Armenian churches here in Los Angeles began having services only in English, the number of people attending on Sundays would drop dramatically. The people would instead start going to the Armenian Protestant churches where the services are in Armenian, and where the cultural context is one they are comfortable with.
Now I know you are concerned about the non-ethnic people who want to become Oriental Orthodox. I understand you wanting an Oriental Orthodox Church that is culturally and linguistically American, just like Henrik wants one that is Swedish. I hope someday that happens. I hope someday we see the American and Swedish versions of the British Orthodox Church.
However, asking the Churches that are currently serving ethnic immigrants to make themselves American or Swedish is like asking a shepherd to turn his back on his current flock so that he can get a new one. Just as you and Henrik don't feel comfortable having to immerse yourselves in Armenian or Coptic culture and language, the immigrants who brought these Churches over with them don't feel comfortable in American or Swedish culture and language. Or at least they don't feel as comfortable with it as with the culture and language of the Old Country.
So basically, the OO Churches in diaspora can either make the recent immigrants feel comfortable and safe, or they can become American or Swedish so they can get converts from other Churches, while alienating their original flock.
I don't believe the latter option is right. I don't believe it is right to ask the Oriental Orthodox Churches to basically dump their current ethnic congregations so they can go after converts from the Catholics and Protestants. Their first obligation is to their original sheep. A Church's first responsibility is to feed and care for its own sheep before going after the sheep of another flock.
Now ideally it would be nice if the OO Churches in diaspora could do both. We are talking, however, about Churches which are only fairly recently in diaspora. Also, we are talking about Churches that have been hit terribly hard by persecution and don't have even remotely the same kind of resources that most other Churches have.
You need to be patient. In the meantime, try to enjoy the baklava and learn a little bit of a new language. It won't kill you.
Or, maybe we can ask the British Orthodox to send a few missionaries our way. Now that
would be cool.