Good question! I doubt if there's a simple way of doing it.
possible ways to increase eligibility: increase the age range for children still living at home, or do away with the child requirement altogether. As I read the critical reviews of the proposal, to realize any kind of significant benefit within that 'measely' $2000 cap limit, one parent needs to be a stay at home parent & the other must make more than $100K... surely, that has avenues to tweak to broaden the eligibility pool! If Harper Conservatives are so intent on squandering a presumed surplus... go big, or go home!