There is anecdotal evidence that seedlings of highland species are more tolerant of less than optimal conditions than mature plants. I don't know how much of that is based on empirical observation and how much is "passive subjective empiricisim", i.e. casual speculation.
In my view, macrophylla is not the hardest species to grow, certainly it's no more difficult than lowii, maybe a touch easier. It will tolerate warmer than preferred nights for months on end, although it does require cool nights for at least part of the year to grow well. It obviously wouldn't grow well in lowland conditions.
Like most highland species, it will tolerate low humidity, with varying results. Sometimes it will pitcher well, sometimes produce small pitchers, and sometimes fail to pitcher. However, leaf growth should be steadily larger. If it's not, then you know your experiment is not going well.
I would say that if you can get hold of a not-too-expensive TC macrophylla, go for it. It certainly will be easier than trying to grow villosa, lamii or even aristolochioides in similar temperatures. I had a greenhouse incident a few weeks ago where temps got into the high 30s and maybe the low 40s for a few hours. Whilst the lowii and macrophylla were fine, several of the aristo had marked negative reactions, with bleached leaves and deformation of the growing tip.
Cheers,
Hamish