Akira - interesting question and I'm not sure how Bruce will answer it (hopefully we'll see soon), but if you had never heard it before and didn't have access to a recording of it and didn't know anyone who had played it before (a fellow student or your teacher, for example), then, just as the most general of guides to what might be "standard practice" (or even just simply "sound good"), you might consult any number of the tempo indicator-to-metronome setting conversion tables that are out there - including mine
My table is a composite of several I've seen and is - as I indicated in my post above and Bruce agreed in his post above - arbitrary to one extent or another.
Granted - it is tricky or risky business trying to come up with such a table and to do so you have to be more than a little presumptuous. For example, deciding on the overall likely playable range of tempos (I picked 30-230 bpm for reasons I stated in my 1st post) or on what indicators to include and what their tempo ranges should be (I broke this overall range down into 14 different catagories relating to specific tempo indicators). If you asked X number of people to independently come up with such a table you'd probably get X number of different tables!
Bruce - you make a very good case with all your examples for why tempo conversion tables are not a useful or helpful (or even logical) thing to undertake - most especially because as you indicate any given textual indicator (Allegro Moderato, for example) has been interpreted and played so very differently by so many different pianists over the course of several centuries (or longer). From one viewpoint - that of high variability of interpretation - your case is solid.
But from just the opposite angle of looking at this - isn't this rather large historical range of actual metronome equivalents for a given tempo indicator across time very confusing to many piano students and a good arguement for either (1) scraping the textual indicators all together as virtually useless or meaningless to the average student and (2) coming up with a good, general, approximate table of tempo conversions that could be more or less agreed upon by the music world at large, thus eliminating so much of the confusion of most of these textual indicators (which are far worse in being arbitrary, it seems, than any table).
I agree that my table didn't allow for all units of measurement, if by that you mean the basic "beat-unit" of a measure - quarter notes, eighth notes, etc. It's based on "quarter time" (2/4, 4/4, 6/4, etc). For "eight time" (3/8, 6/8, etc.) you would, of course, simply divide the values in the table by 2.
My main concern is the need for some general, approximate guide for beginning/intermediate level students, who need it alot more than advanced students & professionals - who will, as you indicated, pretty much do their own thing based on their years of experience and artistic judgement. But telling a beginning level student that there's no metronome equivalent setting (or better yet a RANGE of settings) for some vague Italian tempo indicator that has been historically interpreted as being anywhere from mm=k to mm=t, where k & t are fairly far apart is, to say the least, not at all very helpful (I don't mean you personally here).
Maybe this topic needs to be over in the Adult Beginner Forum just as much (or more) than being here.
Hoping to hear from you soon.