That's the principal of a poncet platform and yes it gets rid of field rotation IF you are accurately polar aligned. Within a couple minutes of the pole. But that's only one problem you face.

You will need some way to guide it, on both axes as even a very tiny alignment error will screw up an image on declination as well as RA. Also you will find you have periodic error of the main drive gear to remove. This isn't easy at all. Mounts that limit this by design to only about 3" of arc start at $12,000!!! So you will need to guide that out. Computer controled PEC helps but still you have to guide. Then there's atmospheric refraction that changes the effective speed of the drive depending where in the sky you are pointed. Lower has more drift from this. An object near the horizon is a couple minutes or more higher in the sky than it really is. At the meridian it is correct east to west but still closer to the zenith by a bit, again depending on declination. Then on the other side it again is high by the time it sets. The result is an object moves slower than siderial rate! Some actually adjust the pulse rate of the drive motor for this but it changes with declination. Hence another reason you have to have a way of guiding the exposure when taking through a scope. Shoot near the meridian to reduce this problem.

The best way around this is to limit individual exposures to 1 minute or less. Then throw out those where the tracking was poor (probably about one half), then align and stack the remaining 100 or so images. Using a low read noise camera is a necessity here.

I've seen it done but those who do it mainly do it to show, yes you can do it if you want to go through all the work needed. Also they used commercial platforms of high accuracy (and cost).

About the only way to align such a platform is by the drift alignment method which takes a lot of time at first but if the system has fine slow motions to adjust the alignment on both axes it can be done in 30 minutes once you are familiar with the process. That would get you close enough for 1 minute shots if your gears are up to it. The precision necessary is very high.

Now if all you want to do is put a camera on it to track the sky with say the equivalent of a 100mm lens or less then the platform should track well for 5 or 10 minutes but through a scope of any focal length at all the errors will show far quicker than you think they will.

There's a good reason you don't see deep sky shots taken this way very often!

Rick