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Instantaneous Strain-Stress curves for Mooney Rivlin Constants

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I am using viscoelastic material for modeling a rapidly deforming rubber part. The maximum strain is expected to be around 25%. I have the standard hyperelastic tests results, some short term stress relaxation test and DMTA for the elastomer. The test data is enough to get the Mooney Rivlin constants and Prony series constants. However I do have a problem here: I am using MSC.Marc! and the software needs instantaneous strain-stress data. Is there any way to find the instantaneous stress with the data I have? I have the low strain speed hyperelastic data (uniaxial, bi axial, and pure shear) and the stress relaxation master curve and I need temperature dependant Mooney Rivlin Constants.

Thank you,