There are no adapters that make this switch. It's easy to get a Contax mount lens in an M39 camera because the M39 is wider and so the lens will fit inside. No way to do the reverse and stick an M39 on a Contax without permanently butchering the Contax camera body. But lenses for Contax are usually less expensive than their Leica counterparts, especially the 50mm offerings since they don't have a focusing helicoid, so enjoy!
I could be mistaken and may be reading your post wrong though. Do you want to put the CZ 5cm f/1.5 on an M39 camera? If so the only way is an adapter like the Amedeo. I've had two of them and they are amazing. Don't waste your money on any other adapter, they just aren't good enough.
Remember you can also shoot the Russian Kiev mount perfectly and the Nikon mount wides with no problems. The Jupiters are all good lenses as long as you get a mechanically solid sample with good lens element centering. The Helios-103 is a great lens as well and for the price there's no reason not to have one.
Phil Forrest