I have experience in ICU and med surg. My WOC was originally paid for by my hospital. I went to HH/hospice and used it, but let it lapse because it's high $$$ to get and maintain, those companies wouldn't pay up front, would have you pay, then reimburse in increments. The LTC where I worked paid for classes to renew to the tune of about $3000. That was 4 years ago. I'm letting it lapse, as in dialysis, we don't do wound care, but send out referrals to the wound clinics. It's expensive to do on your own dime. Without experience in wound care, the creds don't matter.
I would let any potential employer know during interview that you are interested in wound care. This way, they can help you develop once hired