These are the Regs I think are poorly written and contradictory:
"010.2.1 Established MA's
...
These MA’s will remain affective for team building, team positioning, facilities, until new MA’s become effective.
The most recently established MA will be used. If a rider has an established MA in both the Premiership and Championship Leagues, established in the same season, that leagues MA will apply to that league. To be effective 7 days after the last qualifying meeting."
"011.4.2 Guest Rider (G)
Replaces an absent regular team member subject to the following: -
c) the guest must be in a current team declaration and have an
established MA. The MA must be the same or lower than that of the absent rider. If a rider has an established MA in both Premiership and Championship leagues the MA for the league for which the rider is guesting, will be used. If the rider does not have an established MA in that particular league then the conversion factor of 1.5 will apply."
I assume the get-out is the bold wording in 010.2.1, while the italicised wording applies to double-uppers-downers who will have two MAs from June onwards. This is because the italicised wording in 011.4.2 is clear that if the rider has an Established MA in both leagues, then the appropriate league's MA will apply.
Therefore, 011.4.2 needs to be written to agree directly with 010.2.1, rather than rely on cross-reference interpretation.