If youīre in a hurry search LL for "Aptus scratched", it was discussed before, a quote from Yaya, a few weeks ago:
"An IR filter replacement for Aptus 22/ 33MP, if done in the factory, is 999 EUR or 470 EUR if you buy it as a DIY kit. (prices ex. VAT)
I donīt know about mount change, might be a lot more.