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What would you charge (by the page? by the hour?) to transpose F. Horn parts for a euph player
replacing the horn in a brass quintet?

Although I use Finale, not Sibelius, the simple transposition of a part and/or score in a pre-existing document should take very little time at all (under an hour, I'd say, unless it was a really long or complex piece, and then it's really just error-checking/spelling that takes a while).

For example, I do copywork for $20/hour, based on my efficiency and experience (master user). In general, hourly is good for professional copyists while per page ($5 - $15) would be good for people who need more time to do the job.

Inputting from a printed part/score: $15 for up to 3 pages @ 8 staves/page (8.5"x11", portrait mode), 5 meas/staff; $8/page thereafter. Includes one proof, two edits, and one complete printed copy. Add'l copies @ $1/page. Add'l editing at $40/hr, billed in half hour increments.

Use the fingerings for Bb horn in this table:

http://www.thefrenchhorn.net/docs/fingeringchart.pdf