It’s worth clarifying a few things first.
The rules in the Appendix apply at WFDF events (like Worlds) or if an event specifically mentions that the Appendix is to be used. Otherwise the standard rules apply, which says you only need 5 players (rule 5.1).
“Available” basically means ready to play. They don’t have to be standing on the line.
Only the timeouts remaining for that half can be used.
Hope that helps