Hey Tom; There is no solution, I install a R&P system in my 58 about 8 years ago and ran the signal wires to a toggle switch on the dash. With the horn I drilled a hole in the back side of the hub and used spring coiled wire (like in a race car). So the horn is where it is suppost to be. The turn signals I seen some people have used is an MGA gravity switch.
Good Luck
Russ Austin
58 TR3A TS/41804-L Current
59 TR3A TS/55585-L Current
60 TR3A TS/71992LO Gone
62 Spitfire Gone
75 MGB Long Gone