Hi Tim,
So you have two informations missing. First is the key that this thread can help you:
regarding READ_TEXT for long text
The other is the dificult to read that binary inside HANA, as we don't have all functions in hand there, we usually convert it on SLT.
On this wiki Justin Molenaur's convert this on SLT:
How To...Load and Convert SAP Long Text into HANA using SLT
Regards, Fernando Da Rós