I'll have to figure out focus stacking. Have never done it before
I've done it with either Helicon Remote (needs a attached laptop) or Magic Lantern which does the same thing, is free and just needs the camera & a tripod. Assemble with Helicon Focus.
However there's one catch, the reason for which there are macro slides: When doing focus stacks from a stationary tripod, the field of view / magnification changes with the focus - so when assembling there's missing data you cannot conjure up later when an object is far up front of the focus zone, this shows as a blur around this object. You can postprocess-coverup this, but only to some extent.