Instead of using microlensing, why not 'wait' for cosmic nature
to take its course?

All those exoplanets discovered so far, orbiting extremely close
to their parent stars, will eventually transit those stars, as viewed from Earth.

How so?
It involves 'precession' of a planetary orbit close to its
primary.
A good example is our own Mercury orbiting the sun.
Its orbit tilted 7 degrees from the ecliptic, that same orbital
path around the sun is being gradually shifted over the centuries due to
orbital precession.
Precession shifting of the orbits of those 'hot Jupiters' should also be taking place, light-years away, allowing the exoplanet orbits to enter into steller transits in the coming years and decades where they can come under the scrutiny of photometric and spectroscopic analysis.

Another alternative?
Use radio telescopes.
If our own gas giant, Jupiter, is 'noisier' than the sun at some radio frequencies,
doesn't it stand to reason that one of those discovered exoplanet
similar in mass to Jupiter, may also be 'noisy' in the radio frequencies
and detectable by Arecibo?