No it won't be what's on the table just now. But you will have to do the ATPL theory and you will have to do a LST. The transfer of type ratings you may get a group pass on initially but then they will follow the normal currency rules in the EU.
Letting on one colleague runs three type ratings he is expected to be validated on 3 types ? His type ratings cost him over 20 k a year on recurrent s what do you think 3 validations would cost on top ?
That's exactly the reason why it will change to stop one EU citizen having a economic advantage over the others flying exactly the same type of planes in exactly the same countries. We can't have 3 types active at one time.
The validations would be one off's at about 800quid each I suspect which will be tax deductible unless they say you only have to do one and types which you have time on in the previous 12 months are granted without check.