user function for multiple substitution

Now I use bash script sed to convert esperanto x-system to unicode

#!/bin/sh
sed -e "s/cx/ĉ/g" -e "s/gx/ĝ/g" -e "s/hx/ĥ/g" ... ktp

so that :%!xeo to convert whole file or visual hilite region then :!seo

How to define a user function Xeo to do the same thing?

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