You could make basically something like the Vornado, but internally instead of just having a simple heating element, you would have something like 10 times what the Apollo has. There's enough room to do that.
It would run nice and quiet, produce enough heat, look great, consume about 1000W-2000W or so(configurable) and generate around 20TH/s. It would be a great little space heating machine that gives you a few sats while running it.
My only guess is that it would be too expensive, but I'm not sure about that really...
Mining gears manufacturers make more, better and easier money when selling to industrial-scale miners, they don't even make those loud 1200-1500W gears anymore, it's all 3kw and above now, they know that mining is no more a home thing, and only large farms will afford to buy a dozen miners each, so give them what they want, a large farm rather manages 10000 gears of 3.5kw than 30000 of 1200w gears, also the manufacturer rather deal with 10,000 possible warranty claims, support, and shipment that dealing with three times the number.
So the majority of buyers are happy with these loud gears since they don't mine at home, the people that make them are even happier, why bother making a small miner? this will cause them many problems, 10k space heater miners will be bought by 10k people (maybe half the number of they are lucky), so instead of dealing with 1 client that can place a single order of 10k miners, you will need to deal 10k or 5k clients, many of which don't understand a damn thing about mining or/and how to set these little miners up.
Also, manufacturers are bottlenecked by chips supply, labor and time, so if you have 1 million chips, 100 engs, and 3 months, it makes a lot more sense to build something you have already built, you have clients that have already PAID upfront and a thing that is easier to build, why would you go out of your way to satisfy the average joe who wants to heat his bedroom while mining some sats? nobody is going to do that.
But even if someone else was going to do what you suggest, how would they exactly cool 1000W-2000W without moving enough air? and to do that you will end up using "load fans", the setup you are talking about is limited by the chip efficiency, with the current efficiency we have, any hashrate close to 20th will be in the 1200w range if using something like BM1397, and then about 600w if using something like BM1398BB but will be extremely costly.
Maybe someone can modify the Apollo miner to give it a better look, maybe put double the chips to get 4-6th and improve the cooling, that might work, but again, will cost an arm and a leg to make, I think the best thing home miners can do for now would be to buy a few Apollo miners if they aren't happy with just one for a space heater.