You will have a hard time getting a full blown 2 meter bipe under weight.  There is a reason very few have offered one and the ones that do are very costly.  At this moment the Fliton bipe is over weight and they are working to correct this.  Oxai bipes are close to the limit and even the ones that Chip Hyde had are very close to the limit and you have to be very careful with equipment choices to get them under weight.  You have to use high quality balsa and exotic materials to get it under weight and this drives the cost up.

The first question is what do people consider reasonable...

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