Hi,
I have flown a currie wot with a fixed skid (no brakes) for the last 23 years.
Taxying on grass is fine up to about 15kts x-wind, a bit less in summer if the grass is baked and hard.
Landing on grass is ok up to 15kts (soft grass) down to about 10kts hard grass.
I try to avoid tarmac.
I cannot taxy on tarmac in any x-wind, if I have to operate out of a tarmac airfield I "walk" the aircraft to the hold, then take off into wind.
If I try to land on tarmac in even a 5kt x-wind, I know to expect to loose directional control at the end of the landing run.
I have flown a turbulent with a fixed skid on grass ( lovely aeroplane)
and have seen them fitted with a wire brush attached to the skid for operating on tarmac (good suggestion to ask the Tiger Club - I think they did this also).
Yes, I think a wire brush from Halfords (saw off handle), drill a hole in your "shoe" retain the brush with a 1/4" bolt.
Best stay away from brakes if you can. Keep it simple
Best
J.J.