You can try and use the Refractions Override with pure black too...this should do the job.
And this can fuck-up a lot of things in scene :- ) It's very obscure, and not many people know it, but
Refractions override, can also affect the reflections and light in the scene because it affects the rays on its last step into the space.
It doesn't work 100perc. identical in way like Direct visibility override, which doesn't affect anything at all, only visibility.
Here's my workaround:
As long as you always use fake (thin) glass for architecture windows, you almost never have to use global refraction override. If you need refraction override for elements with real refraction ( like organic water pitcher, glass, wine bottle, lamp, etc..) add black refraction override through the material.
Also, regarding background and reflections in photoshop:
Know that reflections will only correctly stack up, if you composite them in linear (32bit mode in PS). If you composite in gamma (8bit or 16bit PS mode), there is a trick, select your alpha channel, and change gamma of it through image adjustments :- ) It will brighten up the alpha part of glass and they will show more reflection.
Best way to composite additional reflections from reflections pass is through Linear add in 32bit mode, and Screen in 8/16bit.