I think, a WC might still be possible. Not entirely sure, but maybe. I did a WC once, where I didn't do much at all for the first ~50 years, didn't play optimal and still finished 50 years before the end date.
Important things to note if you want to try it:
- Use the last 32 years of holy war as well as you can. Just before 1650 hits, start several holy wars with infidels, you will still be able to complete them with the cheap CB.
- Force personal unions on all Christian nations. When you inherit, you will inherit their colonies as well. If there are any republics left, destroy them as soon as you get a reasonable CB (at max 2 infamy/province, most likely Imperialism). You need to stop them from colonizing, otherwise you will need to use more infamy. It may be necessary to declare a war on them and occupy them (not annexing) just to keep them down.
- Maximize infamy reduction (fairly obvious). Get the NI cabinet as soon as possible, always have a 5-6 star diplomat. NEVER get to zero infamy.
- As soon as possible, grab the NI Revolution and Counter-Revolution. Use it. If necessary, change governments every few years, just to get those juicy 1 infamy/province.
Best of luck.