The "PAR" 40-20-10 end fed has been on the market for years, sold under a few different vendors now. Currently Vibroplex. I acquired one to evaluate about 10 years ago and I liked it so much I've kept it in my camping antenna go-tote. I used it for Field Day this year and worked coast to coast QRP. What it might lack in sophistication it makes up for in convenience.
Mark K5LXP
Albuquerque, NM