When composing a figured bass Roman numeral analysis for a chord that has more than one suspension, is it typical to denote both suspensions, as I have done at the end of my analysis?
Yes, you've done this exactly correctly!
You can even take this one step further by showing, for instance, that the
4-3 also then moves to
And the same will apply to the next measure as well. One interpretation of this is to view it as a V chord with a 6 and a 4 held above it (albeit as passing notes, not as suspensions), in which case you could use a
4-3 (and even an
8-7!) along with the V.
But as I said, that's only one interpretation of that next-to-last measure. Another one is similar to what you did in m. 4 with the I64 moving to V.