Does the 1231 support bonding the 2.5Gb and 1Gb into a LACP linkagg? Does it support power redundancy for splitting the POE between two switches? Is there a way to have preference on the 2.5Gb interface and failover or will it load balance?
Maybe you can use static bonding for using both ports at 2x 1GbE but LACP doesn’t work at the moment.
Splitting power budget is not possible as far as I know.
Do you know HPOE required on both ports?