There are things you could try but I can't guarantee it would work, such a putting a relay in each of the front circuits.
The running light circuit would be connected to the replacement lamp though the normally-closed circuit of the relay. That would make the lamp light up for the running light aspect.
The turn signal wire would connect to the coil of the relay. At least in theory, when the turn signal was activated, the relay would switch state breaking the running light power to the lamp, making it blink in time (but in opposite "phase") with the actual turn signal command.
Being in opposite phase is no biggie, IMO, as a blink is a blink. But, whether or not the blinker circuit would respond properly to the load of the relay (almost certainly much less load than the lamp itself) is not known to me.
Then you have the whole kludge aspect, and associated costs, rather than just using the right thing in the first place.
As to using just turn signals, I guess that is your call. Not sure if there are any legalities involved or whether it results in a materially diminished state of visibility to oncoming traffic.
Last edited by whoaru99; 07-15-2019 at 01:23 PM.