How tall are Daruma isolators?

I wouldn't remove the feet of CDP, too much trouble and may be more complicated task than you think. If you want to use Daruma's just put some type of "spacer" pad under them till they are high enough to fully clear CDP feet.
There are all kinds of cheap material you can use for spacer pad, one is black ceramic tiles for bathroom at local home improvement center.

Better but more expensive device is Aurios 1.2 with top bearing, gives you 1.5+ inches of clearance depending what size bearing you use on top.

Also if you prefer to use wood riser/spacer pads in local home improvement center go to wood molding section you will find hardwood trim boards 3 x 1/4 and 3 x 1/2 dimensions that you can easily cut into 3 x 3 pads.