It should be very visible to users that softwares are unable to keep with time zone changes anyway (including those due to the relocation). If they are able to keep up somehow, probably manually, then leap hours don't impose any additional requirement to them.

Or, you can abolish the time zone to make software developers very happy [1]. At the expense of everything else.

[1] https://qntm.org/abolish

If you don't do any tzdata updates in a century then I can guarantee you that the application will be showing wrong local times anyways. Timezone changes happen. That is a already occurring thing.

And it's not like there is even hard deadline to do the changes, nor would it come unpredictably. If any schedule we set would seem problematic, the change can be deferred by another decade or two to get systems fixed if really needed.