[pile o' wrx]

Not likely. Every pic I've seen of the eg33's harmonic balancer has the 4 small holes recessed substantially.
An EJ22 is only recessed about a 1/4 inch.
An EJ25 has flat face.

Every Suby I've ever worked on I either use a strap wrench around the balancer or jog the flexplate over until I have a bolt head and place a prybar as a wedge.

Personally speaking, I've never seen a Subaru tech ever use this tool. At least the ones I know of either do what I do or have built a custom tool to accomodate ALL EJ/EG/EZ balancers.

Usually a 1" thick disc of steel with a hole in the middle, 4 .125" pins welded in place and a 2.5' long handle. Makes a great beating stick for those rummaging through your toolbox uninvited.