Brown's gas is so highly explosive that any sane gas collection scheme will separate the hydrogen alone and only collect that. Storing hydrogen mixed with even air is just way too volatile and dangerous...no one without a terminal illness and/or death wish would attempt to compress Brown's gas.
You can make hydrogen in a plastic pail with a tight lid and hose connected with Lye water and aluminum foil; just put the pail in a bigger container of cold water as it's exothermic and will melt the pail otherwise. Easy on the aluminum. The first trash bag you fill via the hose will have some air from the pail. If you light that floating bag with a torch, it will EXPLODE loudly. After that bag, the air is gone and subsequent bags will just go quietly with an almost invisible and barely audible blue whoosh. This is nothing compared to the volatility of Brown's gas with pure hydrogen and oxygen.
Magnum Energy's off grid inverter is quite popular for cost/performance and claims to be a transformer isolated, low frequency design. Yet it still blows away the AM band entirely in a home wired with unshielded Romex. So yes, the low frequency designs can be better, and like the much lauded and long lived Trace SW series, they tend to be more robust and reliable, but there is a lot more involved in good EMC in design that just the topology of the design. The early German Sunny Boy inverters were reported to be much better for EMI, but they have gone transformerless designs to compete as well.
Remoting a decently reliable inverter, and adding filtration after the fact does reliably work, it's just simpler and cheaper to solve the problem in design. For example I've had both military grade filter companies Genesco in California and RFI Corp in NY develop special high performance filters for home inverter use that use less than 15 watts of power 24/7 due to capacitance. Both were able to exceed -100 dB of filter performance at 100KHz and above. They do cost roughly $2500 US, and do not change the directly radiated emissions from the inverter or the attached DC side wiring, so a remote setup is still needed. For new construction, I also highly recommend all home wiring in EMT (thinwall steel) conduit with compression fittings. It was and is a technical/public health blunder to have unshielded wiring all around you and then plug in many strong sources of EMI such as switching power supplies, variable speed motor drives, etc. Just one particularly bad power supply can trash ALL the entire connected wiring. Again, something you can prove to yourself with a $15 AM radio in your own home, on or off grid.