I’m assuming work and personal?
I’ve done the same for years, but am thinking of making use of the second SIM slot in my personal phone and using profiles to separate everything. Many phones can also use an eSIM, so that’s also an option for multiple numbers.
TIL that version appears to be on the AUR: MicroEMACS/PK 4.0.15 customized by Linus Torvalds.
Last updated in 2014, it probably has serious cobwebs now. Even the upstream hasn’t been touched in 6 years.