argh……………………..why…….
there are a few hacks you could do…. none are probably worth the hassle. Pretty much anything you can do in .aspx can equally be done in PHP through WordPress.
THERE WAS A RANT HERE BUT I THOUGHT BETTER OF IT AND DELETED IT
If you can ever get them both to run on the same server. You could split the site, and run wordpress in a folder (not sure if you can config iis that way) but then you’d have a single .aspx homepage and every other page on your site would be in a sub directory.. last time I had to deal with IIS i think you had to set an entire domain to server one language.
You could hack your theme add a custom page template, which has an iframe which draws in your special aspx page from a complete different server/web address. down side you’d have to explicitly set the content’s height, you can try and do it dynamically with js but in my experience its tricky to get it to work.
you could use PHP and curl to ‘scrape’ the content from the .aspx page (elsewhere) and the spit it back out where you want it. would required a fairly high level of php coding which i’m guessing is the point your trying to avoid.
every way of doing what you what you want makes me think ARGH.. what every you do it will cause you nothing but headaches and problems going forwards not to mention potentially have to duplicated everything, from servers, databases, design, maintenance… etc.etc.