Jacks,
Your list would do for me as well But, we don't know enough about you!! What you really, really like, what compromises you are prepared to make, how much you want to spend, how much riding you have done, on what and where - you get the idea.
Any one of your criteria goes off into multiple sub-points; for one, "reasonable fuel economy" is way better than 50 MPG (UK gallon) nowadays for EFI and you can't buy a new bike in the UK nowadays that does not have FI + a cat converter etc. Hence you are not going to get a good DR650 in the UK unless you are very lucky and wait for ever for it to come up for sale. Even then the asking price may be silly money because of the rarity factor - check out what some people are asking for Africa Twins and then see what you can get for the same money in later models of bikes that are not so hyped.

When you have found this elusive bike that scratches all the itches I would like to know about it!

It did not take too long for the "twin Vs single" list of bikes to appear, so just to widen things a bit more, check out the Kawasaki KLE, 650 or the earlier 500 (also known as the Versys).
You probably know that there is a lot of information in all sorts of threads about all the bikes named here; technical stuff, fuel ranges, modifications, comparisons of one bike with another, or one bike with multi-others, it seems endless.

Just for another single to consider, have a look for information about the Royal Enfield 500 single for a contrast with all of the other bikes listed, so far.

Good luck,

__________________
Dave