I have checked up the multi-fuel burners. Most of them are of the loud type, and they don’t have an internal cleaning needle. However, some are with silent burners, and could probably be built into an old stove, like the Optimus 155, if needed. Their output seems to be very high, up to 3kW.
However, by searching on “Petroleum Kocher” (kerosene stove), a few German sites pop up. One even sells brand new Optimus 155 and spares. One, like the Topplicht site, operate in English for those who don’t read German.
I guess, for serious cooking, one 2.5kW kero burner, plus one Origo 1500 single burner stove is ideal. The last one’s ability to set on simmer heat (and then with a perfectly blue flame) is very useful.
Btw, during browsing the www, I came over a discussion about kerosene and smell. One fellow stated that by adding 5% denaturized alcohol to the kerosene, the kerosene lamps just about stopped producing any smell.
Arne
PS: Yesterday I came over this Swedish site on Kerosene stoves. It is a Facebook site, so maybe one must be on Facebook to make it work. Hopefully the translator makes it understandable.