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There's no need to resort to that level of inefficient and complicated indirection. In most terminals, one can simply type control-v control-x to generate the character denoted by ^x, where x is...

Use printf inside sed to create a form feed and remove it:
sed 's/'"$(printf '\014')"'$//g' inputfile > outputfile

That is a form feed, octal 014.

How to embed this in other things can vary, but you can try \014 inside strings in awk. Whether sed allows this depends on your version of sed.

$ cat input.txt
first line
something else
Pattern Data Data Data
Data Data Data
Data Data Data
...
$ sed -n "/Pattern/,$ p" input.txt
Pattern Data Data Data
Data Data Data
Data Data Data...

Most systems don't have dos2unix.

Any system will have tr.

tr -d '\r' < dostext > unixtext