The individual reef ties along the new "foot" are intended only to gather up the excess reefed canvas and should not, IMO, be tied in tight to the boom. This puts tremendous stress on those lightweight cringles and can cause a tear (especially when they are tied in in advance, before hoisting the sail).
We spent 20+ years sailing in a predominantly heavy air region so reefing was commonplace - we generally just stretched the outhaul(reef clew) and let the excess sail hang. On some boats this may create a problem so you may want to gather it up with the ties, but do so loosely.
Using the existing reefing blocks/lines will work fine.