Can CSPs use nominee structures as part of their operations in relation to transferable securities or admitted instruments for crowdfunding purposes? (Edited)

Under the Markets in Crypto-Assets Regulation (MiCA), is it permissible for an EU trading platform for crypto-assets that is operated by a crypto-asset service provider (CASP) authorised under MiCA to pool its order book with that of one or more non-EU trading platforms operated by an entity or entities that are not authorised as CASPs under MiCA?

When, pursuant to Article 93(8) of Directive 2009/65/EC, a UCITS gives written notice to the competent authorities of both the UCITS home Member State and the UCITS host Member States, of a change to the information in the notification letter submitted in accordance with Article 93(1) of Directive 2009/65/EC, or a change regarding share classes to be marketed, should the documents referred to in Article 93(2) of Directive 2009/65/EC be included?

Which type of rebates or discounts on transaction fees or any other benefits for investment firms acting on behalf of retail clients or opt-in professional clients are out of the scope of the prohibition to receive payment for order flow specified in Article 39a MiFIR?

Does the prohibition of receiving payment for order flow (PFOF) apply to situations where the order is not executed on a trading venue, for instance for products traded over the counter (OTC)?