Yes - get the adapter
Yes - get an IR blocking filter
Modded - Don't know, David P and Ken have these but they don't use them for guiding. Paul Ponders has just got a DSI for guiding because it's apparently more sensitive for that use, but that may be verse a normal ToUcam not a modded one.
You don't need a grunty PC to use a ToUcam, they only use a USB 1 port. But the better the computer,the less likely it is to drop frames.
Gary uses EP projection with the ToUcam.
HTH
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