Some time ago, a monkey researcher separated infant monkeys from their mothers. Some were fed in isolation with a bottle attached to a wire screen. Others were fed from a "surrogate mother" which was a crude contraption covered with terry cloth, which provided a little bit of warm contact along with the milk.
The monkeys raised with minimal stimulation were quite mal-adapted, and had a very difficult time when reintroduced to other monkeys. The ones with the terry-cloth surrogates were still somewhat screwed up compared to those raised normally by their mothers, but not nearly as badly.
By analogy to this research, maybe sex-surrogate dolls would be of some help to frustrated INCELs.
BTW, the research I refer to was conducted by Harry F. Harlow. Here's a link describing them:
Wow, hadn’t thought about Harlow for about 40 years!