You might consider a telescoping vertical for your tripod if wanting a freestanding antenna option.
There are affordable 5.6m telescopic whips on eBay and similar.
Awhile back I deployed a temporary vertical antenna built with an inexpensive 13' telescopic crappie fishing rod, light gauge wire, and a tripod. The rod was around $12 at Walmart. I used one counterpoise wire of about the same length on the ground. A tripod is not even needed if you push the rod a few inches into the groud, wire tire it to a support, or similar.
I had a balun at the feedpoint, but a simple ferrite choke or even direct coax connection would likely suffice if not dealing with much common mode noise. About feedline, whatever small affordable coax should suffice for a typical portable HF receving antenna deployment. Lightweight RG-174 is popular for portable HF work.
I used like 50' of bulk RG-6 since it was just a temp antenna in the yard. Anyway, mine worked okay for a quickly tossed together receiving antenna IMO.