I haven't tried it, but it sounds like fine idea to me. Are there VNC clients available for the ipad?
sure. Mocha VNC Lite is free and should do it for a test and is available in the iTunes Store. But honestly on the iPhone I was only able to see the mouse pointer moving. Touching the buttons was an issue (only in cuelux). But I don't have the newest version yet.
Maybe easier to set up for a test if you never used VNC could be Team Viewer (also available in iTunes - the free version). It works on a iPhone but the experience is not really a good one as I have a lot of scrolling
And it is weird as I have to first slide the mouse pointer to the corect position before being able to "left click"
If the look on the iPad is good I will be happy to test other VNC clients to find one with a good control (i.e. which allows dragging of the sliders too)
UPDATE: I have tested additionally the following apps as mocha VNC isn't really a help:
VNC Viewer: everything does work including moving the faders (tap twice and hold the second tap). But again it is weird as the mouse tap doesn't happen where you tap but where the mouse pointer is. The mouspointer is moved by sliding the finger on the iPhone like it is a touchpad
My new favorite: Connect Desktop: Mouse click happens where I click. Sliding the faders works by double click and holding the second click down. But sometimes the single clicks do work - sometimes not. Maybe somebody with an iPad can test this one if he has the same issues (I have only the phone).