Bruce Mills's solenoid release with the manual release cable immediately above it. The bar on the brackets causes the cables to pull the latch downwards instead of backwards, which is what is needed to move it.
The manual release on the rear bulkhead. No security in a roadster of course, but the perp would have to be looking for it to find it.
Bruce's smooth lines, minus door and boot locks and handles.
My own efforts: The two convenient holes in the standard latch frame to mount the cable plate
The pivoting lever, with A the first hole I drilled, and B the second. A needs the line of the cable to be downwards and slightly towards the rear panel i.e. significantly different to the ideal run of the cable which is from the hinge edge of the boot lid to the latch. B means the line of the cable can be almost direct.
Cable plate mounted, arrowed are the plan A hole and round bar. The plan B arrangement means a much straighter pull on the pivoting lever.
The cable clamp, ideally this would be on the other side of the plate clamping two thicknesses of the cable. However this would need the outer support to be over an inch further back than shown, and a significantly longer length of exposed cable inner would be required. This may prevent a choke cable, for example, from reaching the bulkhead.
Version B fitted.
Version C using a bonnet-release cable which has a longer inner as well as being longer overall. The inner is long enough to go through the latch lever and back towards the outer. The distance between the bracket supporting the outer and the bar allows for the full travel of the trunnion clamping the cable. In this picture and the next the latch is released.
In this picture and the next the cable is pulling the latch lever fully into its release position.
Installed. The corners on the bracket supporting the outer may need rounding-off.