Try a footpod!
A footpod is basically a looped, adjustable strap, one end connected to the camera, and the other end held under tension by your foot. I found a description online a couple of years ago, and made one with about $10 of parts from the local hardware store. I used:
- nylon strap with connectors (long enough for 2x your height)
- caribiner for connecting strap to hook assembly
- hook with thread for your tripod socket
- locking nylon nut for adjusting tripod screw depth
- metal "fender" (wide) washer
- rubber washer to protect camera body
To use it, I'd just thread the hook into the tripod socket, then put the end of the strap loop under my foot, and
pull up on the camera. This creates a tension, and, like a monopod, stabilizes the camera in one dimension.
Let me know if I can describe it more helpfully!
By the way, I went to Portugal a couple of February's ago, and was surprised that it was pretty bright most days. I rarely found that I had too little light; more often the opposite. If you're up in the hill towns, it can get really foggy, which can create some havoc with light meters.
--John