I personally feel that replacement behaviors, by themselves, are not likely to really make the necessary changes. I know this is true for me. SI tends to develop in people with a lot of trauma in their background, and that stuff has to be dealt with before the replacement behaviors will do any good.
I see that you're offering help and advice that has helped some people, and that's good. I just think replacement behaviors alone are a bad idea.
NEXT PART ***TRIGGERING*****- PLEASE READ WITH CAUTION OR NOT AT ALL!!!!!!!!!!
I know that for me, replacement behaviors that involve any kind of action taken toward my body tend to blow up in my face and have the opposite effect from what I was hoping for- no matter how well-intentioned I am when I begin.
One time, I tried writing words expressing my feelings on my arms. I ended up injuring myself with the pen I was writing with. Another time I tried a less sharp object, hoping to just pull up a layer of skin rather than cut myself open. I ended tracing and retracing the same line until I caused a cut deeper than I would have if I would have just let myself use a razor.
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So while Sky's idea might work for some, I caution everyone to really think it through and also don't try to use replacement behaviors ALONE. I think it's best to talk about this stuff with your T while deciding what you're going to do to get past this. (Of course it is hypocritical of me to say, because I have generally kept talk about si to a minimum in my own therapy- but honestly, I probably should have talked about it more).
Just some thoughts