Setting config values for integration tests

I’ve been trying to set config values both through config-global.php and using MagentoFrameworkAppConfigStorageWriterInterface but it appears this isn’t working.

I’m aware of Issue #39230 on the Magento 2 github but I haven’t seen any workarounds posted for this issue and I’ve been struggling to figure out one myself.

Anyone out there who has come up with a workaround?