No, it is not possible to redirect to a different Assembly Version. Different Name or Strong name is not possible with assembly redirects.
It is possible to circumvent this. A technical but simple way is to simply disassemble all the strong named assemblies and recompile them without the strong name. This is easy by using ildasm and ilasm or with a PE editor. See here and here. And while you decompiled it, why not also remove any license checks? Obfuscators won't help unless they are able to prevent decompilation. Another way, already mentioned, might be to use the public key to delay sign the new assembly and turn off assembly verification. Or since assemblies in the GAC are only verified during installation you could replace an existing assembly in the GAC. The last two do require administrative rights.