I think there are quite a few options on the market. I have some good ones that came on my folder, think they replaced the OE, but couldn't tell you what they are.
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Can't see the point of removable as you still have to store them somewhere as you say.
I find Brompton pedals to be OK but I always wish for something better and probably grippier too. Does anyone have experience with upgrading pedals on Brompton? There are some models with quick release, but then where to store removed pedal. Any good upgrades with foldable design?
How about this one, we are currently evaluating this design.
What can be improved? My first impression was ... wow so heavy !
You probably won't find a better folding pedal for the Brompton (counting in all relevant factors) than the factory one. But a lot that are way worse in many aspects. You will find better removable pedals but the better ones are expensive and the main issue is that - at least to me - they are way less practical in daily usage. Check the various products from MKS and you are there - they do probably provide the best quality in removable pedals.
Personally, I've no relevant issues with the Brompton pedals for about 15 years now.
There's always a way.I use Shimano SPDS with a flat side and an SPD side. The extra bit they stick out isn't a problem for me and having my feet clipped to the pedals is more important to me since I can pull up as well as push down and easily rotate thecranks to a convenient spot when stopping.