I don't know about modern steel drop or trekking bars (you just have to google search I guess) but you could use some basic steel flat bars with basic steel bar ends. Cheap if not a bit heavy. You could use a set of older steel dropbars from a 1970's era bike and even spread them a bit to create some flair but they have a smaller central stem diameter. I did that for a 1969 Gitane rebuild.

FWIW, although you don't want a diagnosis, someone else with the same issue might. The creaking is from dry metal flexing against dry metal. The same sound sometimes comes from a crank set. Take it apart, add a little bearing grease, and it should go away. Super tightening doesn't work. The little bit of grease won't make your bars fall out.