One issue Kevin would be finding a suitable LED bulb. It would likely have to be LED as the bulb itself would have to be amber to work with the clear lens of your wing top lamps and match the existing bulb holder. Another issue would be providing an adequate load to the flasher unit which would probably require external load resistors. There are CANBUS/no hyperflash LED's available but most seem to be for the BA15s base bulbs.
Would you be averse to using the dual colour switchback LED's in the existing indicator position? This would allow a constant bright white light fed by sidelight circuit interrupted when indicator selected to flashing amber as discussed above.
Since my last post I have discovered CANBUS friendly switchback LED's
here at reasonable price. These have the advantage of flashing amber and off during indicator sequence as a bright amber/white flash is less easily interpreted. They come with BAY15d base (same as stop/tail bulbs) so would require a pair of new bases to accommodate. Again have found these
here. Have ordered both and intend to swap lens to the deeper clear L794 type I already have which allows for integral reflector.
