Interesting route to Mexico you have .
When you enter Mexico you will be sold personal" visa" and a " Temporary Vehicle Import Permit. "
and you put down an additional SECURITY DEPOSIT ( max. $400USD) which will be refunded when you cancel the TVIP when leaving Mexico BEFORE 180 days.
All these documents are valid for 180 days. If you fail to cancel within that period you do NOT get the deposit back .
For your case you could go to one of the Mexican " Frontier Zones" and cancel the TVIP , get your refund and the store the bike inside a town within that frontier zone until you return .This could be done in Quintana Roo( Chetumal city) in Chiapas near the Guatemala border or in a border city along the USA side.
If you go back to Germany and can be back into Mexico within the 180 days you could just leave the bike anywhere , but then you would need to hustle it to a border crossing to get the TVIP cancelled before it expires, and get your deposit refund.
Then you turn around and go right back into Mexico and buy a new set of documents and pay the refundable deposit again for 180 days .
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