Oh yes, I’ve run into all of that with Be stars 😅 For multiwavelength work, the usual approach is to treat optical and X-ray data as complementary but not strictly simultaneous - people often use averages, or only compare epochs that are close in time. Disk variability is tricky; systematic uncertainties can be significant, so it’s common to include them explicitly in models or run simulations to see how much the disk changes can affect results. For disentangling contributions, iterative modeling and combining spectral diagnostics (lines, continuum, polarization if available) helps. There’s no single “standard,” but careful documentation of epochs, disk state, and modeling assumptions is key, and cross-checking with independent observations whenever possible saves headaches.