For chest congestion I like Aloe vera thickened with Xanthan gum and 1% Eucalyptus oil. (If you have them stir in 1% Menthol crystals, but be careful if using on kids.) It's not a perfect solution, but for a stuffy head it does the trick.
I like to use straight-up eucalyptus eo for colds and stuffiness. I just dab some on a tissue and tuck it into my shirt pocket or bra.
but I'll bet if you melt some beeswax, add a little oil of choice, then scent with euc or other similar scents, you'd have a nice rub or salve. I would start with 1 part wax to 1/2 part oil, then adjust until you get the consistency you like.
I make a salve that reminds me of Vapo-Rub, although it's a little greasier.
I also use the salve as an ointment for cuts and scrapes.
Take about a 1/4 c. olive oil and into that I add about a tablespoon of beeswax. I put it on the stove until everything is melted. You can add some vitamin E if you want. Pierce and squeeze 2-3 capsules.
Once it's all melted together, I take it off the heat add some Tea Tree and/or Eucalyptus and then pour it into a jar and wait for it to set. The book says to add 80-100 drops of the essential oils of your choice.
I found the recipe in an Aromatherapy book by Valerie Gennari Cooksley.