Hi Dell
as i said earlier i wouldn't risk it, i have a hand pump hydraulic press and have used it for broaching 5mm key way but it doesn't like intermitent pressure, a press with rack and pinion will work as you can keep the pressure constant with no stopping. I used to work at VSEL in the super finishing department and we used hydraulic broaching machines and they do it in one pull.
Your decision but imho broaches are too much money to be destroying for no good reason, the idea from Mikes Workshop is very easy to implement.
Regards
Mike