I have actually done as I suggested to you - not the first time that this has happened - and have finded a summary of Wells's claims, entitled "Earliest Christianity” , copyright © 1999 by G.A. Wells. It can be readed here: https://infidels.org/library/modern/g-a-wells-earliest/
From it, I gain the following facts, which may help you.
"R. Eisenman and M. Wise (in their The Dead Sea Scrolls Uncovered, Shaftesbury (Dorset): Element, 1992, pp. 2431) observe that at Qumran the use of the noun ‘Salvation’ or the verbal noun ‘His Salvation’ is both ‘fairly widespread and much underrated’. They instance a phrase such as ‘the children of Salvation’, and they point to ‘the personification of this concept in the Gospel presentation of Messianic events in Palestine in the first century’. Another factor which may well have contributed to the naming of Jesus is that, in Greek, ‘Joshua’ is rendered as ‘Jesus’, and Joshua was the model for some who claimed (or were expected to come and claim) supernatural powers. Details in my Did Jesus Exist?, 2nd edition, London: Pemberton, 1986. p.69 n.28."
This passage reveals that Wells discussed the Dead Sea Scrolls in his arguments.
The document in question contains no reference to demons, but it is only a 5,600 word summary rather than a complete book or even an index to a book by Mr. Wells.