Have you looked into any other DAG tech, besides IOTA? ByteBall and Raiblocks are excellent, functional and mature examples in my opinion that lack IOTA's downsides (likely because they are intended primarily for p2p payments, not IOTA's intended use case as m2m first, p2p second).

In full disclosure, I own a little bit of both. I first stumbled upon them after being disappointed with IOTA, and they deliver on a lot of what my initial expectations of IOTA were. I just want to be able to buy coffee with my crypto and not wait an hour for confirmation times!