I don't think the repeater lamps would draw enough current to work properly. Speed of flash will be dependent on current draw with the original units.
Changing the flasher units is very straightforward. The most difficult challenge is bending up a thin bit of metal to mount them.
I would suggest you start with the Hazard module and check my assumption is correct. If all well then replace indicator flasher. Once everything is working happily with new flasher units you can replace the bulbs.
The electronic flasher units should have the same interval regardless and I would fully expect them to fix your issue.
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