Exactly - the Pyrolyse Oven is meant to be an MV machine as shown from its recipe. I mean to use it to improve my charcoal production over the 12 coke ovens + charcoal like igniter that I currently use that is still very manual, such that I can produce a more steady stream of MV amps. However, if it means that I have to craft a HV precision laser engraver, forming press, assembling machine and chemical reactor in order to craft the necessary infrastructure for to produce Kanthal, I find it rather extreme; I had to push my current steam setup to the limit to produce the energy and dig through the world for emeralds for the data control circuits. A Vacuum Freezer should be more advanced tech than a Pyrolyse Oven and should therefore be harder to manufacture, however I don't think it makes much sense for the former to be necessary to produce the latter. Just my two cents.
You make a good point there. And now I notice that the Oil Cracking Unit, which has a controller made with HV components, uses rings of cupronickel Coils. WTH? The other multiblock machines that can use kanthal coils, the EBF and the Multi Smelter, can use cupronickel and nichrome coils as alternatives, with changes in functionality (different heating capacities for the EBF, and different numbers of concurrent smelted items for the multi smelter), so maybe something similar could be done for the pyrolyse oven, e.g. allow biomass and simple charcoal production with cupronickel coils, but require kanthal to get the efficiency/speed increase from adding nitrogen, and require nichrome for making heavy oil.