I think I would address the envelopes to "Brother" and then try to change my handwriting when adding the address. That way it looks more "mistakenly" unfinished .
Also, if you all would like to exchange address lists so that the postmarks will be from out of town, that could be good or not. Depending if you live in a small town and do not want to be suspect. Maybe there is someone near the Bethel area that will remail for us.
Also...for those of us who are not active at a KH and have no lists of MS and pioneers.....is there some central location that has that info that we can find out???
I think the letter will be wasted on all but a few elders.
And I would not bother to send letter to Bethel because they will only warn the halls.