That's not how TTL works. Or do you mean propagation after changing an existing RR?
It's "common" to lower a TTL in preparation for a change to an existing RR, but you need to make sure you lower it at least as long as the current TTL prior to the change. Keeping the TTL low after the change isn't beneficial unless you're planning for the possibility of reverting the change.
A low TTL on a new record will not speed propagation. Resolvers either have the new record cached or they don't. If it's cached, the TTL doesn't matter because it already has the record (propogated). If it doesn't have it cached, then it doesn't know the TTL so doesn't matter if it's 1 second or 1 month.
This is what the NETMAP target in iptables is for - map an entire subnet to another subnet, including the reverse. We were doing this 20 years ago for clients trying to on-board other companies that they'd bought. It's horrible, but it does solve the problem in a pinch.
I do not understand this rhetoric of Apple hardware being so amazing. The only moderately impressive thing they've done for years is the M chips. Beyond that, it's just crippled, overpriced, and unrepairable.
They have shiny cases, yay. I'll take my ugly Thinkpad and actually get shit done over a shiny case and glossy screen.
How are so many Americans so mistaken about their own constitution?