First off - total freedom from the nightmare of "matching"!
Second, really good hold - Using st-30 (perimeter) plus a new glue I was introduced to - name I will reveal in a forthcoming post, after a few more tests - 2 weeks no problem... more than that a bad idea all round.
The only issues you will have, is the nape area, and I would be grateful for any tips in response.
Also - I am wondering how short we can take the sides & back, but will report back as I learn.
All in all definitely a solution, which people in the real world can use! "Spotters" may notice the "nape issue" but general public will not, especially if you show a part, or a bit of hairline.
I get round the nape issue by getting the base made shorter at the back and attaching under the head bone, not on the nape. At the nape I leave a strip of my own hair which the full cap hair covers falls over and mixes in with.
This works well with the longer-medium length styles, not sure how it would go with short ones.