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I call it "RISO Galaxy" .

Hi! I've been working with risograph printing lately and I was wondering if someone here has used Affinity for riso before. As with screen printing, riso printer works with grayscale files. Despite that, several printing websites recommend to use registration black for small text (12 pt or less) and 100% K for bigger text, though I've also read that it's better to use always 100% K for any text. If that's true, the printer recognizes CMYK values. If I use Publisher to make a riso printed fanzine, should I make a CMYK color format file instead of Gray? For instance, If I work using swatches of black ink only (100% K, 80% K, etc.) and I want to export a pdf file while keeping the same % of black without being changed to a different value, I think CMYK is the obvious solution. However, I often find myself confused with color modes and profiles and I thought it'd be interesting to know your opinions or sharing experiencies regarding the use of Affinity programs for riso printing. Thanks in advance!