Ah - I see you have the misconception that (somehow) Boot Camp has some function, other that providing a means to install Windows, and provide driver support for that install. If you install Windows (you don't need Boot Camp at all to do that) by simply booting to the Windows installer CD, and erase the hard drive, then Windows will certainly install, and you can boot Windows natively. You can do the same with various flavors of Linux (whatever might support the hardware). It's especially easy if you don't want to continue to have OS X installed, so the ONLY choice is whatever OS you have installed.
The challenge is the various bits of hardware that are, to some extent, unique to the Apple hardware, such as the trackpad, and the multitouch capabilities that may have. You can then get the "Boot Camp" drivers for that (and the other stuff, such as power management/cooling, vid drivers, etc) that may give you the best optimization for whatever Mac model you have. Nothing in Boot Camp will help you with drivers for operating systems other than Windows, and there's limits to Windows versions that are supported, too. I suppose that the multi-touch gestures would be the biggest surprise, if that works in Solaris.
What does top in Solaris pro cps give you that the unix top in your OS X system does not do? Seems like you could simply replace that file, give it the correct permissions, and (assuming it works at all) then hope that it actually would work properly with a unix system. (as you can tell, I don't know - never tried)
Finally - what prevents you from trying Solaris? Boot to your choice of a Solaris install, erase the MBPro hard drive, and install away! I think the Solaris 10 or 11 should get you a booting install. Everything should (mostly) function, and the trackpad would be - just a trackpad (no gestures, probably) Left click/right-click would likely be exactly where you would expect (front left and front right corners), or might need a control key press to get a right click menu.
Have you tried booting the MacBook Pro to a liveCD, and running the Device Driver Utility? That looks like a good way to determine if you will have large challenges for drivers (or not)