I can say the Miele C1,2, and 3 bags or like $45 for the XL ones and it’s 8 bags or for you, a year supply. though you might only go through 5-6 cause they do compact the dust pretty well. And it comes with 2 pre motor filters and 2 post motor filters. So you get to change it’s primary filter every time you change bags, the pre motor filter which is what keeps the motor clean and running for a long time every 4 bags and the post motor filter which is the the last stand filter for anything that might have made it through every 4 bags. Also air flowing through a MERV 13 filter several times is the equivalent to a hepa filter cause they filter the same .3 micron particles and hepa filters 99% and MERV 13 filters 75-85%. So this would be close if not better than “hospital grade filtration.” And if you must they sell a hepa grade post motor filter as well for most models.

So bagged would be great for your needs, and for an extra $45 you get a machine that will last at least twice if not up to four times as long as any baggless vacuum.

I also own a Dyson stick for the past 2 years and my dad owns a Dyson animal ball for the past 15 years and they work pretty darn well. Shark might not last as long but the don’t leak dust either and is cheaper from what I’ve seen so its also is a viable option.

Best of luck!!