I vote for the fewest possible changes involving the least-possible amount of programming time to enable users to split their UTXOs. BCH announced to the world that the wallet community will bend over backwards to support whatever broken shit the hard-forkers spew out at the last moment.  I'd suggest not reinforcing that message.

The two proposals I've seen are a magic OP_RETURN value [which is not supported by most wallets, but is supported by Armory], or an output to a magic P2SH address [Much more bloat, and it bloats the UTXO-set too], which can be done with any existing wallet.

The question ultimately cannot be answered until we actually know for sure what will be implemented.