Actually Unity3D 3.5 has been [updated to C# 3.5][1]. If the source code for this library is available you may try to recompile it for 3.5. If it do not use any 4.0 features like parallel for etc - it may help.
Android and iOS devices [works with .NET 2.0 only][2].
[1]: http://unity3d.com/support/documentation/Manual/MonoUpgradeDetails.html
[2]: http://unity3d.com/support/documentation/Manual/Android-DotNet.html
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