Is there a way to do a partner award booking with a stop over with mixed class? For example, economy for segment 1, business for segment 2? This is for Finnair, NYC-HEL-DEL.

I know segment 1 has economy availability, and I know segment 2 has business availability. But using the website, it prices out with only both segments in economy. If I change the dates to a time when both segments have business, it prices out to all business.

It'd save me about 20k miles if I can price it out as a stopover, even if I was paying business class prices for the whole thing, hence why I'm trying.