Yes; both with the use of a different master cylinder[to obtain more clamping force for less effort of their braking finger] Bou with a Brembo [or Nissin 11mm] 10,5mm piston and Fuji using a Nissin 11mm m/c over a 9.5mm Brickemtik m/c.
Lots of calipers will provide braking to the front wheel .......https://youtu.be/YrZVa7sz4eo?t=1m43s Front brakes used to only have 2 pistons not 4 pistons; from manufacturers such as Brembo Grimeca and JPA [ Now Briicbrac] ,,,and they worked as can be seen in the video .....
Its not a case of brakes working, in the case of the Brickbrok Evo17 special more rigid alloy CNC machined ,lighter pistoned calliper it is the the fact that it helps make the front brake lock solid using less effort from the riders finger .......if people do not need that type braking then its of no real interest to them. The brake was developed with Adam Raga who also when at GasGas as their supported rider was one of the driving factors behind shaving weight off the GasGas and so trials bikes went from weighing over 80kgs to around 70kgs wet ....all to help with his trick riding techniques.......the reason why certain people do not see the value of such things is that they do not ride at such a high level or are not trying to ride at such a high level .......but if they were then they would understand the advantages.
At clubman level trials a Francis Barnett with drum brakes can beat a brand new Beta Factory Evo At National and International Level the bike could not compete even if it had more power and was allowed to enter and some one wanted to ride one at that level it could not happen.and brakes is just one of the reasons.
There is an argument against every thing that tries to help a rider reduce fatigue and effort required to ride...Helmets do not need to weigh 950g lots of people wear helmets that weigh 1200g .....Back in the 1950's brakes were so poor and bikes weighed so much; making braking even harder that riders were forced to wear flat caps that weighed only 200gms in order to save weight. I
In conclusion most average club riders riding a clubman route do not even need disc brakes nor a bike that weighs as little as 70kg or a mono shock rear suspension ..........all those things are needless developments for a rider that rides up and down a few small bankings on a Sunday. https://youtu.be/WEZljnqiUg4 They seem to be managing quite well.