As I've stated earlier, my buddy created Time Locked Cold Storage cards (bitcointalk user Yogg), which seems to be exactly the type of thing you're looking for. No need to create an altcoin for this. I see these as a great way to force yourself to save bitcoin.
"Coldkey Cryptobonds are the first time-locked, non custodial, physical Bitcoins.
You and only you chose when they become spendable.
It makes a perfect instrument to plan Bitcoin savings.
Or a gift of an amount of Bitcoin to someone, that cannot be spent right away".
More information about how Cryptobonds work :
Like every other Coldkey, Cryptobonds bear a private key under the hologram, it's associated BTC public address is present on the front.
We achieved to time-lock Bitcoins by creating a transaction using nLockTime, an obscure feature of Bitcoin.
The transaction code is the biggest QR code, on the front.
You will need to scan it and broadcast the code to the Bitcoin network when it has matured.
The Proof of Concept has been published on Bitcointalk :
https://bitcointalksearch.org/topic/annpoc-coldkey-cryptobond-first-timelocked-physical-bitcoin-5228739A few test Cryptobonds were produced afterwards and sent to a handful of reputable Bitcointalk users for further testing of the concept.
Cryptobonds' locked transaction is specifically designed to be as leightweight as possible.
A single input and a single output, with a 5000 sats fee attached to the locked trasaction.
This is to make sure the transaction gets rapidly included in the blockchain when it became valid, many years from now".
https://bitcointalksearch.org/topic/m.56324891