Perhaps CoinCorner or BottlePay would work.
Otherwise, there may be another method that supports Euro DCA and⚡️support in this list:
Exchanges with support for Lightning Network https://cointastical.github.io/Exchanges-With-LN/
Also, there are bot tools for automating purchases on exchange platforms that do not currently have DCA methods, as described in this post:
Dollar Cost Averaging. The answer to the question “Is now a good time to buy Bitcoin?” https://cointastical.medium.com/dollar-cost-averaging-the-answer-to-the-question-is-now-a-good-time-to-buy-bitcoin-a84e518f50f0