Another solution - from Dan suggesting named ticks might solve.
With your current setup -99 to +99, 128 ticks, select named ticks, convert your current ticks.
Go in and edit the named ticks value you want to be your default so there is only one with that midi value, i.e, change the second 64 to a 65.
Then there is only a single tick that matches the default value.
Sorry we had to go the long way around to get there.