Wth the 32mm, if you are going to shift past 5mm, I would first consider purchasing the CF. The 32mm in my experience has quite a bit of light fall off when shifted and the CF will assist this. You can also see the effect of shifting this lens in both the Capture Integration and Digital Transitions tech camera tests. The shifts with the 32mm are quite dark and would benefit from a CF.
The front threads of the 32mm are 86mm and course threaded. You can use 2 thin 86mm filters and get 12mm of shift before you start to hit the filter stack.
Lee Filters now makes a series of wide angle rings 86mm, 95, 105mm. These will allow you to use the Lee SW-150 system on the 32mm. You can go with 86mm ring if you don't want to use the CF or the 105mm ring if you use the CF. These rings are not like the other Lee rings, in that they are massive and heavy. So they will add more weight to the front of the 32mm and thus make it even more susceptible to damage to the front element/misalignment due to the weakness of the copal shutter, but it works. Lee now makes a CL-PL in glass in the 150 x 150 size, but they don't make glass ND filters. Thus you need to look to the Hitech or Nisi filters. Both of the Nisi and HiTech firecrest are excellent. The Lee 105mm Ring fits over the CF on the 32mm with no problems and you can get about 12mm of shift.
Here is a link to a video I did on the Lee system and Nisi.
https://www.youtube.com/watch?v=8yfFfNhsr5c
You can also look into the Cokin system. Cokin and Lee filters will not interchange, and I had a lot of Lee for my Nikon 14-24, so I went that way.
Paul C