Mini-synth temperature compensation

[zf]

I'm going to build the Mini-synth as a musical midi-controlled synth with as good tuning as possible.

I've never used temperature compensation so I have a Q:

In this page:
http://www.musicfromouterspace.com/analogsynth/OLD_SOUNDLABMINISYNTH/SoundLabMods.html#FINETUNERS

Ray suggests the replacement of R60 and R61 with 2K 3500ppm/deg thermistors. Unfortunately I haven't found a reasonably-priced source for any 2K thermistors, just 2.2K and 1K.

So, I'm thinking of 2 options:

A) Just using a 2.2K thermistor. It has "B coefficient" of 3900. Anyway these resistors have 10% tolerance... I could of course pick the closest to 2K I find.

B) Using two 1K thermistors in series. These have "B coefficient" of 3730.

What do you think about the 230 - 400 ppm / deg difference between Ray's suggestion and these? Anyway it would make the oscillators less sensitive to temperature from what I understand.

Using the two 1K resistors should make the thing less temperature sensitive (closer to 3500), if I manage to couple them both nicely to the temperature of the transistor?

But this 3500 value probably also varies with each transistor...?

Any ideas, suggestions, experiences?

The temperature changes are especially important to me since I live in Finland and the weather outside in winters would ruin my sound-checks...