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I wouldn't Barlow the 32mm as the eye relief may be a little to long. The 32mm would be a low power eyepiece only. An alternative would be the 24mm Panoptic but it costs a lot more.
Yes you could go a 40mm in a 2" size and given f8 you would still have only a 5mm exit pupil meaning skies would not be too grey. At f8 even a cheap 40mm may perform OK at the edges and perhaps someone with this combination could comment further.
I personally dislike poor edge performance and I'm talking about eyepieces that are out of focus in the outer 30% of field. I would rather have a narrower apparent field or pay extra for a wider apparent field eyepiece that is sharp to the edge. However this was not always the case and when I was just starting out I did buy a 32mm Erfle that had a nice wide field and I enjoyed the views and didn't really notice the poor edge performance or at least it didn't bother me back then.
Note if you stay with a 32mm Plossl in 1 1/4 size you can then use 1 1/4 filters for all your eyepieces. Note if you do want to go to 40mm then the 2" size is better as the apparent field on the 40mm Plossl is only 43 deg. and not 50 deg. as on the 32mm.
I'm sure once you get a couple of Tele Vue Plossls you will eventually add the full range up to 32mm to your collection as they are very good.
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