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It looks like, without support for sideways-lr, there's no way to specify that you want vertical text that starts at the bottom of the element.  Is that correct?

So to achieve the desired orientation, we're left to use vertical-rl with a 180 degree rotation transform...

Firefox has supported this since version 43 (circa 12/2015).

Yes, as you mentioned, 'vertical-rl' + 180 degree transform is the alternative until all browsers support 'sideways-lr'.

One problem with "vertical-rl" + 180 degree transform is that clipping doesn't work as expected.  I.e., suppose my title is "one two three four five six seven" and I'm placing it in an element with overflow:"hidden".  Without the rotation, and the text starting at the top, it clips the end of the text off as expected.  With the rotation, and the text starting at the bottom, you'll get the _end_ of the text, and the beginning will be clipped.