I did attachment therapy for 18 months. And, the schedule you suggested would not have worked for me. I needed way more than that. If you asked me at the time I started therapy I would have said I needed none of that. I believe it is impossible to plan what is needed in advance, except for a having a therapist that says they have done their work and they are solid, so that whatever your needs are they can handle. That is where trust has to come in. There were times I needed my therapist at 3 in the morning, but I knew she would not be available, (this was her way of taking care of herself). She agreed to get back to me as soon as she could. If it was an emergency or I just wanted a response, then it was my responsibility to let her know by email or phone, so that when she accessed them she knew I needed to be a priority. As far as other emails and phone calls, she would respond if and when she could. Lucky for me there was never a time that she could not respond.

Most therapist can only take one or two clients on at a time that have these needs. In addition, it would be difficult if they had a growing family or they were the go to person in an extended family. I was lucky.

I have a standby therapist that does not do attachment therapy, but is very generous in answering most all my emails, especially if I am having self-doubt for a moment or two. She does more than what you requested in your post. I go from zero emails a month to sending as many as six a day. It's still my way of purging, though the attachment piece is good. The last time I saw her, we talked about the struggles so many on PC have with there therapist not allowing, not responding, or sending one sentence replies when a more substantial responses is being hinted at. She is 75, has just learned to text, but I have no plans to text with her. She said she was glad I was able to send emails anytime I needed to get something out and away from me. And, that I should rest assured that she reads all. She also responds to more than half. I asked her once about what happens if I need the attachment piece again, "If you feel you need that then you will get an attachment therapist." She is willing to read to me if I want it(never have), sit next to me to look at things, etc, but she is just a plain old psychodynamic therapist and will not pretend to do attachment therapy.

I have come a decision that no matter what kind of therapist I employ, if they are not okay with me emailing anytime I need or want then that therapist is not for me.

*You have been with your therapist for a long time and I can understand your reluctance to give her up. But, is there a possibility of hiring a separate therapist to do the attachment piece. People hire a second therapist to do EMDR, so maybe it can be done for the attachment piece.

I would like to suggest an emotionally focused therapist ( Sue Johnson). There also may be other methods for working through attachment issues when a corrective experience is needed/wanted, but I am not familiar with them.