There aren't that many yellow species, let alone fragrant.
- Phalaenopsis stuartiana var. nobilis is flashy yellow, but not always fragrant
- Phalaenopsis floresensis can be yellow, I'm not sure it is scented
- Phalaenopsis cochlearis ranges from light green to yellow, not scented
- Phalaenopsis fasciata is yellow but is stripped, I'm not sure it's scented
- Phalaenopsis pallens ranges from cream to pale yellow, not scented
Then you have the flava forms, but just like coerulea and alba, they can be hard to find and cost $$$.
Phalaenopsis hieroglyphica var. flava is gorgeous, but not fragrant.
Phal amboinensis flava would tick the boxes, but quality clones are expensive.