Chris,
I've used one of these since pre IVA: http://www.carbuildersolutions.com/uk/3-pin-led-flasher-relay , no problems at all.
But I have full LED indicators, not a match of bulb/LED's or replacement LED bulbs.
I've a pair of brand new & unused, in line fuses for LED indicators.
I purchased these before I realised that you could buy relays specifically for LED indicators.
If all else fails, you are welcome to them, FOC, just let me know