There will be flicker, that requires a bit more work if you want to totally eliminate that from the headlights.
In order not to put an excessive capacitive load on the lighting outputs, you'd need to split the dropping resistor for the LED's. 100 ohms from the TMCC headlight output, a 100uf 35V cap (watch polarity), and the remaining resistance after the cap. Also, since you will boost the voltage with the cap, you need to add some resistance to compensate, calculate to assume you have 15 volts powering the lights for the resistors.
I've only done this once, a lot of extra components, but it's certainly not difficult to do.
