I agree with Alan. You should rather try to learn to play a number of instruments. When you play in a band it really helps a lot when you need to exchange ideas with the other musicians or if you need to give them instructions, if you know the instrument.
Yeah especially drums (or at least understand it) so you know how to handle different time signatures. And different Rhythms patterns from 1/4 - 32nd notes. 🙂
But regarding the topic, If anything it should improve your guitar playing as with the thicker strings you're applying more force and thus strengthening your fingers for better fretting and stretches (wider frets).
If you use fingers instead of a pick then you're slowly working your individual finger strength on your right hand which comes in handy for things like 8 finger tapping 🙂 Especially if you pluck with all four fingers like Steve Digiorgio