I have the Titan wall chaser in the garage and with 2 blades does just as good a job, there is currently loads of dust guards/shrouds being advertised online for disc cutters which when conencted to a dust vacuum would do a good enough job.
I am soon to order the Metabo with the 3 blade attachment as I got 2 rewires in the new year where it will be very useful. that said getting hold of the triple blade is hard at moment as there is a shortage it seems.
A company called Rhodius do make a triple blade for chasers, there used to be a list of compatible chasers etc but from what i have been told if you have a nice powerful motor in the chaser then the rhodius blade will fit most and do what you need without any difficulty cutting the wall.