I am at the same point with a S2 host, I found a thread here at BLF with pics of a soldered NANJG105C 8x. I don’t like the thought either ruining the threads of the pill. I’ve already searched for a thinner ring like this http://www.fasttech.com/products/0/10001999/1143102-brass-17mm-to-16mm-rings-5-pack but with no success. I will probably use a single-sided driver instead like the Nanjg 101-AK-A1 or the LD25 https://www.fasttech.com/product/1143103 but the latter might be to high to fit, nevertheless I’ve got one on order. Perhaps I will take the driver I salvaged from the TrustFire A8 I recently modded.
Edit: The current project of mine is a Convoy S3 host and the thread I mentioned is this one: DIY + Review of Convoy S3 Host
Different model, same problem.