Sorry, Justin. Not sure why that got caught up. I’ve published it now.

OK, so this is coming 6.5 years late, but here you go: https://creativepro.com/insert-a-character-by-unicode-or-gid.php

Another idea is to create frames that are anchored to each other (or anchored inside another frame).
I talk about something similar here:
https://creativepro.com/creating-dynamic-layouts-objects-move-text-added.php
with a movie here:
https://www.lynda.com/InDesign-tutorials/196-Working-dynamic-layouts/85324/414832-4.html

You can make several InDesign documents and then place the INDD file into a master INDD file. When you place an INDD file into another INDD file, it is imported like a graphic.

I just created a very simple 1-row table in Excel (Mac 2011), saved as xlsx and imported it. In one of the cells, I had some text underline and some with strikeout. It imported into InDesign with the formatting intact.
Try making a duplicate of your file, then deleting all but one or two rows to see if it works. My guess is that something is interfering with the formatting. For example, perhaps a character style is being applied to the text?

Kai: Got it! Interesting technique… the header and footer rows “erase” the stroke at the top and bottom of each column/page. Clever!

Never seen anything like that!