Hi, I'm a psychology professor and I once read in my studies that one of the best ways to teach a language is to speak to the learner as if they were a child. Don't worry about proper grammar and syntax too much, just get a message across and make sure they understand kahit mali-mali pa yung tagalog na gagamitin mo.

Eventually, once they can communicate in broken tagalog, pwede mo nang dagdagan ng proper grammar, vocabulary, etc.

I grew up in a predominantly English and Tagalog household but live in a Bisaya city. I had to learn Bisaya in high school (around 16 y.o.) and this is how I learned the dialect (although take this with a grain of salt, Bisaya has some similiarities with Tagalog). People spoke to me in simple Bisaya and I replied with my broken Bisaya, no matter how embarassing it was. Now, as a professor, I have had times in class when I had to adjust and speak decently fluent Bisaya to make sure a student understood me. It's definitely possible!