Nothing really good.
About the best option is to launch into a *very* eccentric orbit, with the apoapsis almost on the soi, and at an/dn. Then a small burn will complete the plane change. But that leaves you in a very eccentric equatorial orbit, and it's usually quite expensive to get that extreme eccentricity, since it takes nearly enough deltav to escape.
Your best plan was scuppered before you landed. If you absolutely have to launch into an equatorial orbit, for cheap. Land on the equator, it's the only good option.
