Feature request: offset radial origin for polar plots #4217

I'd be really interested in having a nice way to produce polar plots where the origin of the radial axis is offset from the centre, something like this:

Having the radial offset is particularly useful for plotting polar histograms, which tend to suffer from the problem that long bars are over-emphasised relative to short bars because their areas being much larger due to the distorting effect of the polar transformation. Adding a radial offset helps to reduce the visual impact of this distortion.

There are of course hacky ways to achieve this sort of effect, e.g. offsetting the r coordinates of the data, then manually setting the radial ticks. I also came across this SO question. The accepted answer, using floating_axes.GridHelperCurveLinear, is close to what I'm looking for:

However, it's still a bit of a nasty hack, since it requires the radial ticks to be set manually.

How much work would it be to add a set_r_offset() method to allow one to control the relative radial position of the r-axis origin? I imagine it accepting a float between 0 and 1, where 0 would place the r origin exactly at the centre, and 1 would place it exactly at the edge of the plot.