Migrate subcategories as root, and custom options.

Question 1:
We have several stores installed on one M1, and which use one root category for the main store, while the other store views use subcategories set up as root categories.
For example, an office furniture store would look like this:

• Catalog (root for desksandchairs.com)
  • Desks (root for desks.com)
    • Computer Desks
    • Writing Desks
  • Chairs (root for chairs.com)
    • Rolling Chairs
    • Stationary Chairs

Catalog M2 doesn’t seem to be able to use subcategories as root anymore even with changes to the code. Can this extension copy a subcategory on M1 for a particular store view as a root category on M2 for that store view, so that the M2 categories would change to this:

• Catalog (root for desksandchairs.com)
  • Desks
    • Computer Desks
    • Writing Desks
  • Chairs
    • Rolling Chairs
    • Stationary Chairs
• Desks (root for desks.com)
  • Computer Desks
  • Writing Desks
• Chairs (root for chairs.com)
  • Rolling Chairs
  • Stationary Chairs

Question 2:
We also have several products using custom options, but which are set up as simple products, not configurable. They must remain this way so that we don’t have to add/edit thousands of products in the accounting system to match the new SKUs. The other migration service we tried changed these to a configurable product that doesn’t work, and, on top of that, put every single custom option into the default attribute set, which slows down the catalog. Can these simple products with custom options on M1 be migrated to remain simple products with custom options on M2?