I'll answer my own question because I can now - because I got the inner bearing out! (Can't believe how hard I had to hit it - really seized!)Is there a steel sleeve, or bearing land, for the outer race that is pressed into the plastic bore.
There is a sleeve for the inner bearing... it's one long piece that also incorporates the sleeve that supports the outer bearing's outer race. Fortunately, when removing the inner bearing, the sleeve is flush with the plastic bore, so there's no chance of catching the edge of it when you're trying to drift the race out... my original concern.
This thread is great (thanks all who have posted over the years). Now on to bearing installation and re-assembly!