***UPDATE***
Based on information I have gathered on the Internet, and through my own investigation:
To unlock the deck, simply wire a momentary pushbutton or toggle switch to the Orange wire (#411 on the Unlock Decklid relay) to +12-volts. To open the deck wire a second separate momentary pushbutton or toggle switch from a 12V source to the Deck Open relay (yellow-violet wire).
It's VERY IMPORTANT to realize the limitations of the devices. First off, test these connections with a temporary jumper wire to make sure that they provide the desired function, before making any permanent connections. Remember, these are old cars and have potentially been 'customized' by many others before you, so there's no telling what wiring 'fixes' have been made. I have personally encountered several of these fixes myself, so use the described color codes as a guideline only. The wire color codes or designations may not always correspond.
Next, remember that these switches will only UNLOCK and OPEN the deck lid. You can't use them to CLOSE or LOCK the deck lid, so they should only be used in case of emergency to access the trunk and/or to provide access to the convertible top relays & circuits for emergency repairs.
If you are worried or not confident in your abilities to modify or change these circuits, leave it to a pro.
Also, there are Emergency Deck Unlock/Deck Open wiring kits available from vendors online like James English, but you (or an electrician) will still need to make the connections at the harness/relays.
Good luck!