Just so there is no misunderstanding:
FCL.730.A Specific requirements for pilots undertaking a zero flight time type rating (ZFTT) course — aeroplanes
(a) A pilot undertaking instruction at a ZFTT course shall have completed, on a multi-pilot turbo-jet aeroplane certificated to the standards of CS-25 or equivalent airworthiness code or on a multi-pilot turbo-prop aeroplane having a maximum certificated take-off mass of not less than 10 tonnes or a certificated passenger seating configuration of more than 19 passengers, at least:
(1) if an FFS qualified to level CG, C or interim C is used during the course, 1 500 hours flight time or 250 route sectors;
(2) if an FFS qualified to level DG or D is used during the course, 500 hours flight time or 100 route sectors.
(b) When a pilot is changing from a turbo-prop to a turbo-jet aeroplane or from a turbo-jet to a turbo-prop aeroplane, additional simulator training shall be required.
OPS 1.945
Conversion training and checking
(See Appendix 1 to OPS 1.945)
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(d) A pilot, undertaking a zero flight time training (ZFTT) course, shall:
1. commence line flying under supervision as soon as possible within 21 days after completion of the skill test.
If line flying under supervision has not been commenced within the 21 days, the operator shall provide appropriate
training acceptable to the Authority.
There is no way to get first initial JAA/EASA multi-pilot type rating without base training on actual aircraft.