Looking to do an award to SIN and ultimately cover LH, LX, and SQ on a single award. Before anyone harps on me, I know finding SQ F is a lost cause since they don't release award space to partner carriers for F and rarely do so for J. With this in mind, I'd like to do BOS-FRA-SIN-FRA-ZRH(stopover)-BOS in F. It seems LX is very stingy with award space for UA redemptions as I've been monitioring the flights and it seems there are days when 6, 7, or even all 8 seats in the F cabin are available yet no award space is offered. Any advice? To add complexity to matters, LHno longer releases space F until 14 days before departure. Thanks.