  We test the potential of Bayesian synthesis of upcoming multi-instrument data
to extract orbital parameters and individual light curves of close binary
supermassive black holes (CB-SMBH) with subparsec separations. Next generation
(ng) interferometers, will make possible the observation of astrometric wobbles
in CB-SMBH. Combining them with periodic variable time-domain data from surveys
like the Vera C. Rubin Legacy Survey of Space and Time (LSST), allows for a
more information on CB-SMBH candidates compared to standalone observational
methods. Our method reliably determines binary parameters and component fluxes
from binary total flux across long-term, intermediate and short-term binary
dynamics and observational configurations, assuming ten annual observations,
even in short period "q-accrete" objects. Expected CB-SMBH astrometric wobbles
constructed from binary dynamical parameters, might serve in refining
observational strategies for CB-SMBH. Combination of inferred mass ratio, light
curves of binary components, and observed photocenter wobbles can be a proxy
for the activity states of CB-SMBH components.
