No. If you're halfway through an integrated course and stop, you'll have nothing to show for it, possibly a slight reduction on a modular course, but not a lot.
If you already have a cpl, there would be no benefit at all in doing an mpl. Some airlines may take you on, but generally the point of an airline having a cadet program is so they can train you from scratch in their own way. You will be a less attractive candidate, as they will feel they have to unteach all the bad habits you have picked up.