I don’t think so, no
I think the second approach is probably the one to aim for (using pfaffman_server_id as the column name)
I wonder if overriding this method may help:
You can check the current value on the console like
Server.new.custom_fields_fk
If that’s server_id, then I suggest overriding that method in your Server model
class Server < ...
def custom_fields_fk
"pfaffman_server_id"
end
end