I've honestly never seen thought about the cultural implications of steampunk. I have surely thought about cyberpunk, but to me, steampunk was defining rapid advancements in technology, and a sci-fi-like technological jump that was applied backwards. Which is to say, some people going "wouldn't it be cool if we could have had steam powered pens and coal-fired walking spiders.
In this story... I am planning for the "steampunk" elements to play out in ways that clash with the other forms of technology.
There is the "old ways", which cherish the artifacts left behind by the angels. Some of these artifacts are used widely, some are locked away for safe keeping. There are factions that want to expand their use, as it's a "gift". There are those that want to stop their use, as use increases the risk of breaking, then we lose the gift. There are yet other groups that wish to replicate, copy, reproduce those artifacts - that is the group that will likely be in the lead.
This reproduced/copied angel tech will name a name, "New Tech" or something like that. I'm awful with names. There will be a lot of feelings about this, but by and large it will likely be the most widespread technology, followed closely by salvaged, repurposed, or still functional angel tech.
The other grouping of technology will be the modern methods of science. Based on this poll, people seem to prefer a lower scientific level, so I might aim for 1800 instead of 1900. Steam engines exist, but in their basic form. Some ideas of modern medicine (sterilization) might exist. But I intend for this group to look a lot more like what people think of when they say steampunk. Whirring gears, brass, etc.
These groups will clash - angel tech vs steam tech, oh my! There will be religious elements to it all. There will also be those that go "what if we put an energy crystal into a steam engine!" and start to merge the threads.
I think it'll play out nicely!