Hi Stiwy.
Paradox found that iDeneb's wireless kexts work well with broadcom chips, while iAtkos dont seem to work for everybody, so that can be a solution.
You are tethering internet from the iphone

heheh... watch out you dont accidentally connect via 3G and eat up all your download limit.
Right now I would happily settle for the same solution, but for audio. What a headache this is giving me!
But, back to your question. In theory you can insert all relevant kexts into USB stick folder (like A_Tool I created), boot up, change UUID's and install kexts, repair perms and caches, reboot and have a perfect install.
But I must warn you, from what I have experienced, SL is ALOT more sensitive than Leo to KP's, and installs can fail (like Leo) with a wrong move.
I wouldnt want you to erase your HDD and then not be able to boot. Also, dual booting is tricky with SL and Leo, unless you understand UUID's well and play with them so not to confuse the bootloader.
Basically, I do NOT recommend this unless you have a spare drive. I recommend also you DONT erase your working Leo's as it is ALWAYS handy to have.
I bought my new 7200rpm, 320Gb 16mb cache Seagate for 60€ ! I'm no rich man, but I prefer this safety than going out drinking the same amount on a weekend...
I've also give up dual booting. Way too much of a hassle. Booting off e-sata give the same performance, and I'm just using windows for GTA 4 and I hope soon, battlefield 1943 hhaha
I know my "quick heli tour to SL" looks long and complicated, but I find it to be quicker and easier than setting up Leo.
I now have an image of my base install, anything goes wrong (I'm dsdt patching, trying kexts, etc), just format drive, install chameleon 2 (first!), delete boot.ini and Extras folder, restore image, fix UUID, reboot and presto!
Look how fast it is... this is restoring to external enclosure via e-sata (sorry you have to tilt you head looool)


A word of warning to everyone though... You cannot believe how many times I've had to re-start from scratch. It is a very lonely operation as no one is joining me in the adventure of SL. Audio is the final frontier, and its a huge b!tch.
I suggest everyone start understanding how to fix dsdt.aml as it looks like you will need it. In the future I hope to make a dsdt that makes this laptop as real and a MBP ! .. I already tricked software update in thinking this was a 5.1 MBP

- asks me to update EFI Firmware lol