What sort of riding do you want to do? If your a gravel hunter or even just give it ago occasionally have a look at my website
www.advroutes.org.nz Lots of options to grab a couple of gravel legs if you are interested.
Few suggestions that would be do able on the Strom, are interesting (scenic and not to challenging) and are roughly on your route include
Maruia Saddle (south of Murchison)
Jacks and Jollies Pass (immediately north of Hanmer Springs)
Ram Paddock Road (roughly between Waikari and Amberly)
Mackenzie Pass/Hakatamea Pass but you dont get to see the Mackenzie lakes (Albury (east of Fairly) to Kurow)
You already have Danseys Pass

The Nevis Valley is awesome but has 20ish fords at the southern end and a couple of rough creek crossing so not sure if you would be keen for this between Cromwell and Garston)
Lake Hochsetter and Gows Creek (man made mining tunnel) (directly inland from Greymouth/Stillwater)
I'm hoping to do some more work on the web site in the next month (got a few routes from earlier in the year) so keep and eye on it.
Cheers R
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