Nashi pears (Asian pears) work just as well as Conference pears.
This cake is very rich, so you’ll find 1/16th slice is enough for satiety. To cut identical slices, start by imagining a line (or lay a piece of string) across the middle - both horizontally and vertically (to visualise quarters); use the same method to slice each quarter in half, and then halve each half again.
You can cook the sponge in one springform tin and slice it horizontally to obtain the top and bottom halves you’ll need. However, this isn’t a sponge that rises, so you’d have to be really precise with your knife skills or you may end up with broken cake pieces - which would still be salvageable - just not so pretty or easy to work with.
The only way to ensure accurate measurement of ingredients is with
Metric Kitchen Scales (U.S. option
HERE).