Audiohifila
"My powered woofer on my speakers need 7 foot power cords so can't switch out my 5-6 foot upgraded cords I use on my preamp, amp, and CDP"
SURE YOU CAN. Just USE A nema to IEC adapter and another OEM cord you already have laying around. Price? $5 - $20 ea.
Do a search for IEC adapters.. online power comes to mind. VA Audio too offers some Cryotreated ones reasonably. They do work, and are a tremendous aid in running in power cords without running down your gear.
I've done this several times with positive results on pieces with non migratory power cables. The character of the 'newly added' downstream cable will do it's job fine.... it's like the electrician extended the outlet another few feet using a different cord is all.
No sweat.. no prob.