How to flip notes in Wood blocks notation without having lyrics and chords flipped?

Dear Mark,

I often copy stave notation melody into Wood blocks to add relative solfa names under the text. I like my melody stems upwards on the wood block notation and the accompanying bass line stems down. When I try and flip the stems with X, unfortunately my lyrics and guitar chords also get flipped. How can I flip the note stems only, please?

I appreciate your kind help and look forward to hearing from you soon.

Zsuzsa