It won't be a matter of getting the sparks at the right time. It will rather be a means of keeping the heads firmly fixed to the blocks -- the main development issue that they only figured out too late.
To get back to the original issue, the BRM teaqm had the benefit of a beautiful Geoff Wilde 2-stage centrifugal blower that did indeed work and would have been much more manageable with the variable-vane inlet throttle which appears in a line drawing in my book IIRC. Failure to use that was unforgivable.
As well the engine was intended to have SU fuel injection at its blower inlet which would have been another helpful amenity.