Ok Tell me where to get a POH for my jodel D9,or my Nipper,or my Moni, or for that matter my vans rv4 fitted with a one off engine installation.
You are trying to play words. I clearly stated that they may not have a POH, but I will guarantee with my left testicle that all of the relevant speeds for those aircraft you are quoting have been tested and are known. Therefore whatever you want to refer to the 'book speed' as is available for those aircraft. You fly the approach based on those tested book speeds.