Dhruv, the alloys don't make the tyres look wider. Generally tyres and rims are chosen together, and a wide tyre is chosen on purpose, with a suitable width rim to go with it. Thats why you feel all alloys make tyres look wider. The tyres ARE in fact wider when you see them so with alloys. They are not the same stock tyres that the vehicle comes on. Stock tyres are sometimes wider when they come on the top variant with stock alloy rims to go with it.
Using rims wider than needed for the tyre will give rise to issues with tubeless tyres. Only the tread width of the tyre is supposed to be in touch with the road. Choosing wider rims will deform the natural profile of tyres, and make them adhere less to the rim (only air pressure makes them stick to the rim), so on tight cornering or emergency brakes with sideways pressure on tyres, may make your tyres deflate suddenly, leading to accidents (there is one such case reported for Cruze on the forum already).
Bottomline: Choose wider tyres, if you want wider rims. This is usually an expenditure of 15k somehow or other, even considering the buyback of stock tyres/rims. I consider this a waste of money, and the budget could be used for better purposes. But my opinion should not bind anyone into doing anything or not doing anything, so you are welcome to proceed as you see fit.
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