I dont know about a generic name Wazza
We call it wingfoil, but of course the wing is sold for SUP boards too, eventhough tough when not able to go upwind really.
Your thoughts about a high aspect 1550 cm2 wing I understand, as it will have the same lift as a tad bigger wing, can go faster, and less drag so less strain on your arms and better upwind, and unlike the 1100 and bigger span wings, it will be more lively probably (not turn as slow)
I am using a supersmall stab 229 cm2 on my wingfoil with 1800 cm2 wing, as just like on kitefoils it seems to make the foil a lot "faster", more lively and fun
Not very good yet compared to what I see some do, but its coming.