Ubuntu setup executable for windows users

For many potential adopters of Ubuntu, an exe file is far easier to use than an ISO, and they are more comfortable with something called "setup.exe". There are 4 ways to create ubuntu-setup.exe:

1. Bundle burner and ISO in a single executable (or better burner + ISO downloader)
2. Use an approach similar to instlux (i.e. modifying boot.ini and install grub for windows, kernel and an initrd ready for netinstall)
3. Install Ubuntu as an image file withing the windows file system + a bootloader that will mount loop the image and boot from it. This has the additional advantage that it does not require to repartition the HD. Moreover it should be possible to create a dedicated partition later on and dump the image contents in it.
4. A combination of the above: detect the settings and decide which route is preferable. The wizard should also pre-select other installation settings (but still give the option to do something different).