I also use a classical guitar foot rest/stand to elevate my right foot. It works well.
I'm in this boat as well. Granted, I also have some classical guitar experience, but that came many years after bass guitar. Incidentally, I think it came from the fact that when I played in my high school jazz band, my strap kept breaking or sliding off (due to the hole in the leather part having stretched far too much and my complete inability to cobble together any scratch for a new one). I would prop my left left up on a chair and rest my bass on it while standing. Because we often playing in a relatively cramped space, I found that I had more personal flexibility if I both stood and angled the bass anywhere from 30-60 degrees from the floor line. Keep in mind that in my early years as a player I saw lots of pictures of guys like James Jamerson, Paul McCartney, and other 1960s bassists hold their basses at steeper angles. And dang...it just felt natural.
Anywho, the habit stuck. I actually broke my right ankle in the Netherlands over a year ago, so when we played shows, I would use the classical position I knew too well to great effect.
~NvN
P.S. To my American friends, if you break a limb anywhere, do it in the Netherlands. I was in and out of the trauma ward in two or three hours. I was sickly boy, so I was already too familiar with hospitals. This was among the best medical treatment ever.
