I feel like this would just complicate things. PoW is simple, powerful, useful, and has big side benefits to the energy infrastructure of the world. That's pretty great.
I don't see the point of adding Filecoin storage concepts to PoW.
I get the idea of wanting to add extra use cases to PoW's power consumption, but this is just an optics thing. People who don't understand Bitcoin and PoW and aren't educated on its purpose and utility are the ones who attack it. The vast majority of people don't understand these things. Like 99%+ of people. It's just an educational gap that causes bad optics.
PoW is perfect because it doesn't rely on secondary use cases or a secondary market. It's entirely self-sufficient.
So the solution is not to make PoW more complicated by adding ideas from some altcoin. The solution is to continue educating the world so that eventually the majority understand Bitcoin and PoW and a shrinking minority are against it.
The educational keys to the PoW optics problem are:
1. There is no relation between PoW energy consumption and # of transactions so talking about energy used per transaction is nonsensical.
2. There are many more bitcoin transactions happening than what are shown on-chain so even if it wasn't nonsensical to talk about energy per tx the number would still be very much lower than the frightening numbers thrown around by the media and politicians.
3. PoW is by far the most useful consensus mechanism for a decentralized monetary system and is an absolute requirement for Bitcoin's value proposition (and Bitcoin's value proposition for humanity is immense!).
4. Bitcoin will never switch away from PoW so there is no point pushing for the change anyway.
5. Much of Bitcoin's mining has been done by renewables for numerous years now, and some of it is also done with already produced but 100% wasted energy at power plants, which also don't add any pollution to the environment, so compared to the rest of the world Bitcoin mining is leading the movement to clean energy.
6. Bitcoin mining strengthens the energy infrastructure of the world because it can use the wasted energy from any kind of power plant (and power plants waste A LOT of energy), thereby making the energy industry stronger, likely helping lower the cost of energy for society, and allowing humanity to increase energy production (granted this part of Bitcoin mining is still in the early stages but I bet in 10 years the vast majority of power plants will have Bitcoin miners set up on-prem for precisely this reason).
7. PoW is a self-balancing system so the only reason why energy usage keeps increasing is that the economic output of Bitcoin is increasing even faster. PoW mining will always produce more economic output than the energy-cost input. That's just a fact of its design.
8. PoW is already very useful and it is a misnomer to say the energy is wasted. 100% of the energy is used in exactly the way it was designed to be used. The energy is used to secure the most secure network in human history, which operates the most fundamentally sound currency in human history.
9. Bitcoin's energy consumption is still minuscule compared to plenty of other industries, and the only reason Bitcoin's energy consumption is talked about and derided so much is because it is easy to calculate and it is still a new technology that most people don't understand yet so they question it.
...I think those are the main educational points, which, if the populace understood, the bad optics of Bitcoin's PoW would disappear entirely. So that should be the goal, not trying to make hybrid and complicated PoW models.
To the OP, have fun working on your idea though! Nothing wrong with that. I'm sure it'll be fun to try to design it. But since Bitcoin isn't going to hard fork and adopt a different consensus mechanism when PoW already works perfectly, and there isn't really a point to making yet another random altcoin just for the purpose of having a hybrid consensus mechanism, I would point out that this idea should just be an interesting experiment for you and it isn't likely to be something needed by society.