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I used to use Images plus and DSLR Focus (the main one) to focus my DSLR using the same process you are. I found using the FWHM method a bit of a pain with twiddling back and forward to get that sweet spot. I then ignored all those graphs and started using faint stars magnified 6X. Which I found to be more reliable in the longrun, though I would still use the graphs initially until I was confident with the process.
But after using a BT mask for only a short while, the only thing I use DSLR Focus now for, is to display the downloaded image. Yes a bright star is needed or longer exposure lengths, I tend to use about 10 sec but it is soooo much quicker than my previous methods. And I feel just as, if not more accurate.
I did a bit of an experiment one night using DSLR Focus and then the BT Mask. I've been using DSLR Focus since the days of the Canon 300D so I'm well experienced with it. Given that fact and that I know my scope/camera combo pretty well, the BT mask method was still much quicker, even with the longer exposures and as I said I think did a better job of focusing. Remember though I'm talking manual focus, not automated.
Just my experience though. You might have a look at Nebulosity from Stark Labs. I've not used it but I would be surprised if it didn't support the DSI and have the functionality you want.
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