Migrate to other helm chart for wordpress

We currently use our own helm chart for wordpress, which was developed some time ago for a customer with specific needs. It is no longer being developed for that customer, and Stackspin is now its only consumer. Therefore upkeep is rather high, and the technological legacy in the form of these specific features sometimes gets in the way of generic usage.

I'd like to investigate if we can migrate to an existing helm chart.

[edit] The investigation part of this is mostly done. The conclusion is that switching is quite feasible, but migrating existing instances will probably involve some manual work on moving persistent data around. Automating that would be possible but is not warranted by the very low number of instances known to use wordpress (2).