I dont think wat you want is possible

The multimeshes are meshes like clothing in real life, the clothing, a extra layer is wrapped arround the body.
If you can find a mesh for the 34cx34 that has a shirt(with sleeves?) and pants you might pull it off.
You have to copy and paste the textures from the multi top and the multi pants on the body files of that 34cx34 mesh.
But if it will fit? no idea....
You can do conversion from multi to multi mesh, all 4 are build identical, except the shoes and the textures will fit without editing.
uhm, not 100% sure bout the Rengal multi

But Miana/CPU and FM fit perfect.