DSA definitely. While I prefer typing on DCS more (who doesn't?) a uniform profile keyset will be far cheaper (you ARE trying to reach MOQ after all) and allow much more flexible custom layouts. Does your dream layout require a R5 backspace? R3 PgUp and R4 PgDn? R1 -_ key? No problem with DSA. HUGE problem with DCS.
And as for the "We already have DSA Alps keycaps" argument, BULL****. Those are
blanks, not a real keyset. We do however have DCS profile Alps keysets, lots of them, on vintage boards, and with good cheap DCS modifier kits like Badwrench's Infinity kit you can get pretty far with DCS.
I'd love to see successful Alps GBs for both DCS and DSA, but if the goal is to -finally- allow the Alps crowd to build creative customs and Leopold FC660s and Whitefoxes and HHKBs and Plancks... then you MUST MUST choose DSA or face the exploding-costs demon that has so far killed every single Alps DCS GB except Alpine Winter. Choose DCS and your set will either be too expensive (definitely not reach MOQ), too limited for customs (probably not reach MOQ) or too limited AND too similar to Alpine Winter (end up competing with the aftermarket sales of Alpine Winter, and probably not reach MOQ)
I'll remind the dreamers that Alpine Winter only made it because it stuck with a VERY limited (and ultimately very smart) set of keycaps. And LightCycle recently failed (for now) because they tried to make everyone happy, adding huge and ultimately too-expensive extras to the set.
So my recommendation is: Go for wide appeal at a reasonable cost. Support the most common layouts with the
largest keycap overlaps (Planck type layouts can be a problem here, as can JD45 and the like).
Consider a 30-key
'NordEUk' addon kit (the green keycaps in Wodan's original chart) to instantly pull in all of Scandinavia and Germany to your GB.