Integrating Developers in non-tech teams

So this is going to be a long one but I'm looking for some advice… Sorry if this is scattered or confusing or even irrelevant but this is a whole new world for me.

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The question: What sort of operational items do development teams have that make them development teams? I'm leading this project and I really want this to be legitimate and successful so I want to incorporate anything I can that makes developers successful in a true development position. I've never been an actual developer, I'm a mostly self taught coder that came from the investment management world. More background below, but the TL/DR is: "company I work for wants to try having the risk management team develop their own risk management software instead of our dedicated tech teams. First go of it went really well, but sloppy. How do I legitimize, any resources for where to look?"

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I work for a semi-large company in the finance world with some pretty gross old tech. They have an entire technology division that manages our primary systems. However, most teams; sales, operations, risk management, finance, etc. end up needing new tools built rather frequently and budget / personnel constraints make it very difficult to get a hold of new tech / custom software. That said, a few people (myself included) will build ad-hoc tools, mostly out of excel and VBA to automate tasks or enhance processes. I, however, know Python, plus some front end languages and SQL. And I've recently been tasked with re-writing some of our more critical home-brew tools into python applications.

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Now this has gone rather well and virtually everyone in the company was super pleased with the results and are now extremely interested in the potential. So this has become a primary function of my role and I'll be doing the same replacement with other tools. I have other members of my team that will be shifting their role to assist in this as well. Now the issue is; we are SUPER segregated from our technology teams, and from what I'm hearing they aren't super keen to have finance analysts, project managers, and compliance people getting access to the tech side of the house and developing their own tools in their environment. Which is understandable, but it seems the company really wants to experiment with us. Sort of a, what happens if technology and development is dispersed throughout an organization and not siloed?