that top one Looks like my 5 key the botton key looks like
my 335 key. You plug in the module on the 7 right then hit the start/stop
button. So I dont see how it would work on the 53 it would be a pain pulling out the little key in the 7/335 module then sliding it in the ignition.
I agree with Wagner you would have to install the start stop button and then the key module intertion port that seems like it would be may more trouble than its worht.

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2007 335i Alpine White(moms)
2006 X5 4.8iS Sapphire black(Mine)
2007 Porsche GT sliver GT3