This.
In a slightly more technical and helpful answer, think about what the wheel bolts/studs actually do and then think about it to the logical conclusion. That's not meant to sound patronising I promise, but it's a good way to work out whether any engineering thing is a good idea for yourself. The wheel bolts hold the wheels onto the car, and in real terms they hold the entire weight of the car equally over each corner and over each bolt. That's static, but if the car is accelerating/braking/turning, you will drastically alter the load per corner, and introduce massive stresses onto these items. If one should decide to give way for whatever reason, then that load is now distributed over even fewer points, causing more stress which in trun causes the liklihood of failure to increase dramatically. If this causes all of them to fail, and the wheel to fall off, this would be a Very Bad Thing Indeed.
If a bolt is fixed, with no movement at all and everything is located centrally, then there can be no lateral movement causing extra stress. As soon as you try to use adaptors that allow any play at all, you can introduce stress ijn places where you wouldn't want it. Now, in practice you probably won't have any issue with using something like this, however is the risk you are taking worth it to save a few quid when you could risk your car or your life? That's up to the individual to decide I guess. Personally, I wouldn't risk it. There's thousands of wheels out there that will fit the Zed perfectly, and I'd be picking from something in that range or I'd go the extra mile and get a set of wheels made specifically if I couldn't find the style I wanted.