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Any foss alt for Miremote or zaza remote
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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If it's not listed here https://lirc.sourceforge.net/remotes/ you probably have to sample yourself. But maybe first open an issue and wait what the app devs say. Maybe there's a more straight forward way to contribute.
Also, a lot of remotes use identical codes. You might get lucky if you try another model.