Given your condition that for this thought exercise, we are
assuming the Solar Impulse assembly is capable of surviving the toxic/corrosive environment
According to the article Cruising the Cloud Tops of Venus With a Solar-Powered Airplane (Atkinson, 2008), there is a reasonably strong chance that a especially adapted solar impulse flyer could fly in the Venusian atmosphere. According to the studies that it reports, the glider could be covered in solar panels and 'dropped' into the Venusian atmosphere, such as in the diagram below (from the website linked):
Taking lessons from a similar thought exercise performed by NASA in the slides Long-Lived Venus Lander Technologies:
A Brief Discussion Of Technologies Relevant To
Long-lived Landers For Venus Exploration.
(Note: I obviously are aware that the slides are for a long lived lander, but some of the adaptations can be applied to a glider).
They state in the slides that the solar efficiency is almost zero, but as you linked, the amount of light present can be useful. Given that for this question, the assembly can survive the atmospheric chemistry. The issue is largely based on temperature, wind speed and pressure (atmospheric buoyancy).
A key challenge is the electronics, for the motor assembly and for communication with the glider, according to the link above, there already exists technologies that can withstand temperatures of the Venusian atmosphere, specifically, Using silicon carbide as the basis of the electronics as it has been shown to be able to maintain long term operation at temperatures up to 500C.
The biggest problem in the having a solar glider on Venus is the wind, the challenge specifically according to the article Atmospheric Flight on Venus (Landis et al. 2002) is that
In order to remain on the sunlit side of
Venus, an exploration aircraft will have to be capable of sustained flight at or above the wind
speed.
A major limitation according to Landis et al. (2002), is that the
the minimum flight altitude
for remaining stationary at the subsolar point was
about 70 km. Below this altitude the combination
of higher atmospheric density, lower solar energy,
higher temperature (and hence lower solar cell
performance), and high wind speed made it not
possible for this design to indefinitely remain
stationary at the subsolar point.
However, this is not envisaged as being a major problem, as this could be adapted to be used as part of the aerial exploration, specifically from the article:
For exploration of lower altitudes, it is feasible
to glide down to low altitudes for periods of several
hours, accepting the fact that the airplane ground
track will blow downwind, and then climb back to
higher altitudes and fly upwind to the original
point, allowing both high and low altitudes to be
probed.
And an alternative is suggested (but not discussed in detail by Landis et al.):
An alternate technique might be to mount solar
arrays on the vertical surfaces of the airplane, and
to fly in near-polar latitudes.
This adaptation could be used anywhere in the Venusian atmosphere, potentially even on the night side (depending on the sensitivity of the solar panels), as in the answer to How long will it be light on Venus at night? (yes, it is my own answer, but it is relevant here), the refraction of sunlight in the Venusian atmosphere (due to the atmospheric pressure) potentially means that it is never fully dark on the planet (day or night).
A combination of the wind and if the sensitivity of the solar panels is sufficient, then atmospheric exploration by a solar glider on Venus has a potential not to be limited to the day-side.
One major factor that comes up in all references, is that amount of 'moving parts' must be kept to a minimum for any long term exploration of Venus (or anywhere realistically), this design fulfils that.
So, according to studies, it is very feasible for a Venusian-atmospheric glider, not only that, according to Landis et al. 2002 and Atkinson, 2008, it is possible for a fleet of these gliders to profile the Venusian atmosphere and surface.
