Well if and when you do, I can try to help through any obstructions.
There's quite a lot to rtf specifications but quite a lot of it does make sense, as I am beginning to remember, having dusted off a very ancient report writer I wrote once. It does look very opaque, but hopefully can deal with it OK.
I've got something here that can probably cope with more formatting, and it will take \pard \f0 \fs18 \cf2 \u2344?\u2350?\u2360?\u2381?\u2340?\u2375? \u2340?\u2381?\u2357?\u2306? \u2325?\u2341?\u2306? \u2309?\u2360?\u2367?\par and display नमस्ते त्वं कथं असि in the document.