Is an aac tablet/app overkill for selective mutisim

First off, I’m pretty new to this community, so I’m really sorry if I get any terminology wrong.

I go mute about 2/5 times a month, and I’m looking for a reliable way to communicate when it happens. Right now, I’m learning ASL to talk with my sister, but in my opinion, relying on it in public feels a bit impractical since most people don’t know it.

I’ve been looking into AAC tablets and apps, but from the outside, they seem slow and hard to learn. I’m wondering if the learning curve is actually worth it compared to just using a standard text-to-speech (TTS) app?

TLDR: For people who only go mute occasionally, is a dedicated AAC setup overkill? Does anyone have experience transitioning from TTS to AAC, and did it actually make communicating faster or less exhausting during an episode?

Thanks in advance for any advice!