How do you balance multiple MAs in real life?

So I've been taking Krav for a while now, and I like it. Mainly because it's purely focused on practical self defense, which is what I want.

However, my University's winter break is ending in a couple of weeks, and there's no place in my college town that does Krav. So I've been looking at Karate or Brazilian Jiu Jitsu (the only two other than TKD offered within travel distance).

The issue is that I only want to develop muscle memory/instinct for RL scenarios. While some of the the techniques in said MAs may be practical, from what I can tell there'd be many that I've have to learn instinctively in order to advance in said MA.

For those of you who practice multiple MAs, how do you balance which techniques you use in a given scenario (ie: intense sparing)?

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The issue is that I only want to develop muscle memory/instinct for RL scenarios.

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That will come most certainly from real resistance in your training. Look for schools that train with resistance and contact.

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While some of the the techniques in said MAs may be practical, from what I can tell there'd be many that I've have to learn instinctively in order to advance in said MA.

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Anything has to be learned instinctively for it to be useful.

As to the original question, I don't do multiple styles at the same time. There is a lack of synergy between differing paradigms that cannot be addressed when training them seperately. The best way to maximize "flow" between differing paradigms is to spar using them together, ie; MMA-style.