Worry more about what your solicitor will charge you!
All your solicitor is asking for is money on account of costs to pay these items for which you will get receipts and your solicitor should then refund the excess.
I would not think both would be more than EUR1,000 in total unless there is a mortgage deed as well and if so that may need re-jigging so there could be cancellation of existing mortgage and registrtaion of new deed and that could lead to extra notary fees and property registry fees.
As regards the property the norm is buyer pays these costs but any fees payable in respect of cancellation of existing mortgage should be to the seller and fees for a new mortgage to the buyer etc.
Unless the whole share ownership is complicating matters but if so I don't now how? In most cases property registry fees would be about 1/3 of notary fees.
Personally I do not like any form of shared ownership.