Custom fiscal year variant

Hello Group,

I have a requirement to report on custom Period.

The requirement is to report on Accounting Period (AP). Each AP will have fixed 4 weeks.

Example

AP1

28/12/2014 - 03/01/2015 is Week 1

04/01/2015 - 10/01/2015 is Week 2

11/01/2015 - 17/01/2015 is week 3

18/01/2015 - 24/01/2015 is week 4

AP2

25/01/2015 - 31/01/2015 - Week 1

01/02/2015 - 07/02/2015 - Week 2

08/02/2015 - 14/02/2015 - Week 3

15/02/2015 - 21/02/2015 - Week 4

and so on. Hence 2015 will have 14 AP's

I was thinking for having a custom Fiscal Variant. Is that the right approach ? Or are there other options ?

Many thanks in advance.