This is a fairly thin helicoid focuser (unbranded) which I bought on eBay. It is probably amongst the thinnest helicoid focusers available, which could allow for mounting of filters between the lens and helicoid.
Cost: about £20
It extends by 6.86mm in total.
This helicoid focuser is too short when used on its own, but allows for mounting of other adapters between the lens and the helicoid focuser e.g. a filter or other mount adapters. It is well built but has a little play in the mount. To use with the 35mm F3.5 enlarger lens, it would need to have an extension tube mounted onto it as it is just too short. It may work well with wide-angle enlarger lenses which probably will have even shorter flange focal distance; but that is just a theory as I do not own one to test.