Checking session open/selecting variants via AppleScript

I'm trying to put together a script so that after processing an image from C1, I can go back to a particular image in a session and reopen it in C1 without having to find the session, open it, scroll to the image, etc. It's easy enough to open up a given image in a session via AppleScript with something like this:

tell application "Capture One"
set imglist to name of every image
if (count imglist) = 0 then
open "/Users/martin/Pictures/Holden2014/Holden2014.cosessiondb"
delay 0.2
end if
open "/Users/martin/Pictures/Holden2014/_MG_3270.CR2"
end tell

but there are two issues:

1. Is there a way to check if a given session is open in C1 and select it (without going to UI Scripting)? C1 doesn't seem to implement the standard AppleScript window/document objects.

2. Is there a way to open a variant by ID? This script works fine to open the original _MG_3270.CR2, but if I have, say, three that I'm working with because I'm processing for three different colour balance settings (for instance), it would be great to be able to select the second of three variants.