Changing the font w/ lpr?

Hi folks.

I like to write my letters using jstar and then print them
like so:

pr -o4 -t myfile | lpr

After I see the pretty print I can do w/ libreoffice the plain old
10 pitch lineprinter font is kind of clunky.

I'd really like to change it to 12 pitch at the least.  I'm a long time
WordStar devotee and want to stick w/ good old jstar.

I use LO when it seems the thing to do as when I want to embed photos in the
text but....

I've not see how/where to change the default pitch for lpr to use.

Thanks.

Pureheart in Aptos