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You have an interesting situation happening here, I would normally say to people don't exceed 2/3 the capacity of the mount, only having 1 Kg to play with leaves little room to play with. I would be loath to place another OTA above because of centre of gravity issues and having to place weight on the countershaft further down which introduces it's own problem's.
The only other solution I can think of is an Off Axis Guider, I have never been a fan of these because of the small pick-off mirror although there are some around these days that can be rotated. I suppose a problem is going to be the LPI and selecting a guidestar that is bright enough.
I feel you are going to be very limited although Vixen probably understate the mount capacity a little.
JohnG
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