Thank you all for your comments and advice.
I do love the sound and feel of the Bosie and am happily practising three hours a day on her. I don't really want to change until I can afford the 'dream piano' (an expense I can't justify before finding a flat of my own, rather than renting).
But I am still considering a digital for late-night practice, recording myself, and the different modern-action feel (even though it's still not the real thing, a good Yamaha P-series would be closer than the Viennese). For those of you worried about my piano soul, I was never contemplating switching to ONLY digital.

Iumonito, you are right that Petrofs and AFs are cheaper here. And that is likely what I'll aim for in the long run.
Although this may make some folk sick to hear, my Bosie actually cost me only a little over $200 (which is admittedly at the low end) but 100+ yr old Bosies with Viennese actions don't go for more than about $500 even in 'perfect condition'. I mention it not to make anyone envious but only to suggest that some people may find making a trip to central Europe, buying a piano and shipping it home, cheaper than buying in their home country.
Anyway, when I get her tuned next (soon!) I will ask the technician about reconditioning her. And let you know if he has anything interesting to add that hasn't already been said above.
Thanks again for your help, everyone.
Goose