Well, unfortunately EASA also requires 100 PIC hours for a CPL(A). And those hours need to be fixed wing, so your helicopter hours would only count towards total time but you have more than enough of that anyway.
To answer your questions:
1) In general, the requirements for a CPL/ATPL are the same in every EASA state. There might be some regional specialties but that mainly boils down to how well the CAA is managed and how expensive the training/licensing might be.
2) It's correct that an EASA CPL including an ATPL theory credit is informally called ATPL(f). It's the same license just with a remark regarding the completed ATPL theory exams. The requirements to obtain an actual ATPL are laid out in EASA Part FCL.510.A:
(a) Prerequisites. Applicants for an ATPL(A) shall hold:
(1) an MPL; or
(2) a CPL(A) and a multi-engine IR for aeroplanes. In this case, the applicant shall also have
received instruction in MCC.
(b) Experience. Applicants for an ATPL(A) shall have completed a minimum of 1 500 hours of flight
time in aeroplanes, including at least:
(1) 500 hours in multi-pilot operations on aeroplanes;
(2) (i) 500 hours as PIC under supervision; or
(ii) 250 hours as PIC; or
(iii) 250 hours, including at least 70 hours as PIC, and the remaining as PIC under
supervision;
(3) 200 hours of cross-country flight time of which at least 100 hours shall be as PIC or as PIC
under supervision;
(4) 75 hours of instrument time of which not more than 30 hours may be instrument ground
time; and
(5) 100 hours of night flight as PIC or co-pilot.
Of the 1500 hours of flight time, up to 100 hours of flight time may have been completed
in an FFS and FNPT. Of these 100 hours, only a maximum of 25 hours may be completed
in an FNPT.
(c) Crediting.
(1) Holders of a pilot licence for other categories of aircraft shall be credited with flight time
up to a maximum of:
(i) for TMG or sailplanes, 30 hours flown as PIC;
(ii) for helicopters, 50 % of all the flight time requirements of paragraph (b).
(2) Holders of a flight engineer licence issued in accordance with applicable national rules
shall be credited with 50 % of the flight engineer time up to a maximum credit of
250 hours. These 250 hours may be credited against the 1 500 hours requirement of paragraph (b), and the 500 hours requirement of paragraph (b)(1), provided that the total
credit given against any of these paragraphs does not exceed 250 hours.
(d) The experience required in (b) shall be completed before the skill test for the ATPL(A) is taken.
If you can tick all these boxes you may conduct an ATPL check ride on your rated type (simulator of course) and finally get your license unfrozen.
3) This is hard to answer. The way to go would be to get in touch with an ATO and they would work out an individual training plan for you. In the end you'll need the minimum required hours for a CPL(A) and the ATO must evaluate you're fit for the EASA CPL MEP IR checkride (this can be done in a single or separate checks as you like).
Bear in mind that towards your ATPL you'll still need to match the PIC and or PICUS hours quoted above and that an MCC is required.