On 22nd I did send the transaction using Multibit Classic with too small fee.

It was seen in network but was never confirmed.

Blocktrail says the transaction status is "Removed / Expired"

I did reset the blockchain in Multibit but it didn't remove the unconfirmed transaction from legder, it shows it like it was sent today.

Can't add the privekeyes to another client because of mempool conflict.

Any ideas? apart from CPFP

EDIT/SOLUTION: As @HCP suggested I tried accelerating the transaction viaBTC (he did the same)
https://pool.viabtc.com/tools/txaccelerator/

and the transaction got confirmed after all. Thank you HCP!