If you limit "Ratio Aspect to 1" at the export OBJ you will have this! So real quads! ;)
Not regular like classical...but what difference for the Render engine ? ;)

For polymesh in C4D I don't know again if that is satisfying !
Just try it! :)



I suppose that you have seen this another free one ? https://github.com/huxingyi/autoremesher (not tested)