tried to make an automatic enchanted book splitter like in
(https://www.youtube.com/watch?v=yA_sxhSD9fo) but there are too many
types of enchantments for the filter of the ranged collector.

So i suggest following block

• combination of automatic precision dropper and ranged collector
• automatic placement of input items and collection of output items
• prevent items to be absorbed by hopper, magnet, collector ...
• placed under any air block on the way of the reconstructor beam

recipe:

• ranged collector + wooden plate + automatic precision dropper
• some other materials (but not empored ones)

gui:

• 9 input slots
• 9 output slots
• redstone mode (on/off/ignore on external redstone signal)

behaviour:

• check if no item in a space 3x3x3 above block
• get 1 item from input slots and drop it above block
• send a redstone signal to fire reconstructor
• collect items from 3x3x3 space above block and put them in output slots
• wait till all are collected + at least 1s
• next iteration

if something like item tagging is possible:

• add tag "input" before placing above block
• let create reconstructor items with "output"-tag
• only collect items with "output"-tag
• prevent external absorbtion only for items with such tags

Or you could just put a filter item into the Ranged Collector 🤔 Or just use the ranged collector in "Ignore Meta" and "Ignore NBT" mode and just put any enchanted book in, that way it'll pick up any enchanted books.
Sorry, not a big fan of this idea, so closing it :(

filtering of enchanted books doesn't work because both placed books as
also the converted books would match that criterion

alternative:

• filter which counts enchantments on an item or differ between single- and
  multi-enchanted items
• recipe 4 enchanted books around 1 paper
• gui <,>,= {quantity}