I can't speak to Alpa, but the Lee system will work also on the 40 and 32mm, and allow the use of the filters 4 x 4 on the 40mm and 150 x 150 on the 32mm.
The hood I have seen from Alpa for the 32mm (which is new), it doesn't seem to allow allowance for any filters.
The Lee system I have used now for several years:
On the 40mm HR-W, the Lee wide angle hood, with the wide angle ring from Lee. This allows a 105mm CL-PL on the front and up to 2 4 x 4 filters behind. The hood itself will also cut the flare very well. You can also use a 4 x 4 white card for the LCC shot, in one of the filter slots. Capture Integration sells one.
On the 32mm HR-W, I use the CF as I feel helps a lot on shifts past 5mm (noise and light fall off), so I am at 105mm. Here the new Lee wide angle ring fits the 32mm and allows the use of any of the standard SW-150 filter holders, again up to 2 filters. Lee also makes a 86mm Wide Angle Ring in the new style so if you are not a CF user then the smaller ring will work with the SW-150. The SW-150 by design acts like a hood and helps to cut flare.
Only down sides, weight of the 105mm and 86mm rings on the front of the 32 HR-W.
Paul C