Wrap a sheet of copy paper around the fine side of a combination stone, apply compound of choice, and use that. You can recycle the paper when it loads up, and its tough to find a more firm surface that will still take and hold abrasive compound. If you need to go harder, a sheet of baking parchment is about the extreme. When doing convex or Scandi grinds, you can use two sheets of paper to "soften" the surface a bit - it will still be very unyielding compared to most other alternatives. And, you can use the combination stone (Norton India or Crystalon) to put on the initial grindwork. There's no need to spend a lot of $ on a strop unless its a top shelf horse hide strop that you don't intend to use with compound. Even then, you'd do well to get a good feel for things before learning with the basics. Plain paper or newspaper can do a very nice job as a final polish/burnish on most steels.
If you're looking to upgrade your sharpening set-up in general, I make a sharpening block that works great for finish work using copy or writing paper, and also works very well with silicon carbide sandpaper and lapping films. The link is in my signature, many videos, PDF copy of the user's manual, text description, testimonials etc. Is freehand, but the way the block works can help quite a bit learning good angle control.
Martin