Graylag

So, you have problem with matching orbit with just right orbital parameters, right? If you have enough time I would try radicaly different approach. Launch into low circular zero inclination orbit and then perform bi-elliptic orbit plane transfer. With a little fiddling you have much more precise control over final orbit and since you need highly elliptic orbit anyway, you could actually do it with less deltaV than by launching directly into polar. Timing is little tricky though I use bi-elliptic for asteroids every time