I'm one exam away from being a CCVP having already completed the CCNP track within the last three years.
My question is: if I take the CCNA Voice exam, will this validate my CCNP qualification or will I need to take the CCNA Routing & Switching exam as well?
The CCNA Voice requires a valid CCNA and either 640-460 IIUC or 642-436 CVOICE 6.0. You should have passed 642-436 CVOICE as one of your CCVP exams. If so, you will only need to take the CCNA exam (640-802 CCNA). At that point, both your CCNP and CCVP will be validated.
Hope this helps.