Donna, you might find some alternatives to importing clay shapers to mix and blend your oil pastels.
Below are crayola erasers which can be cut to any shape and used much like a clay shaper. They are a bit on the soft side and can leave some residue that can be wisked away. I'm a hard scrubber and do tend to create residue. I still prefer my paper stumps to all else.
Another of our artists (Perhaps Rainy) recommends pipe insulation. She says it's wonderful for blending skies.
However I've found it to be a bit unwieldie because it tends to knock over things in my studio.
Rainy says I'm doing it wrong and I'm supposed to cut it to various sizes and shapes...
However, with my firm hand, it tends to leave bits a pieces about but they are easily brushed away.
A couple of paper stumps are visible in my tray with my oil bars. They are a bit hard to see but I use paper stumps for 90% of my blending. My fingers are the other 10%.
I've also heard of artists using the white vinyl erasers, cut to shapes, for blending oil pastels as well.
With a little experimenting you might find acequate alternatives to the clay shapers.
If you went with the medium hardness color shapers it would allow some flex. I've found the soft ones too soft. The hard one (in my experience) don't have enough give and I don't have the sense of feel that I like.