Mach0, as you can see this is my first post, and I came to this thread because I have your same problem (well in my case I don't even have a HB-26) and I am looking for an alternative hood.
I found out that the only two hoods that fit nicely on the 35-70 are either the HB-26 and the HB-15. Turns out they are both for the 70-300 (HB-26 for the G and HB-15 for the ED). They should give equal performance, in the good sense (DX), and in the bad (FX).
So, so far I personally see no alternative, BUT maybe you could remove some lenght from the HB-26 to work on FX (given the low price they sell for, you could buy another one and "custom mod it" so that it works well on FX).
I am personally going to get a 26 for now.
cheers.