Another potential way to add a bunch of leverage is through split shares. Basically, these are retail yield pig vehicles. They start with a $25 NAV, split between a $10 preferred share and a $15 common share. The prefs get a preferred dividend, and the common gets a levered play on the underlying portfolio. They tend to overdistribute on the common, so the NAV often decreases. But that just makes them even more levered.
As an example: TSX:FFN is a portfolio of 15 US/Canadian financials. Largest positions are BofA, JPM, WFC, and GS (in order) so potentially attractive valuations.
The NAV in total is ~$16, so the NAV to the common is ~$6. The common trades at $6.26 CAD, so you're paying something for the leverage. They distribute $1.20 to the common per year (until they bottom out at whatever the NAV minimum is). This is close to 3 to 1 leverage on a diversified portfolio of financials at relatively low cost.