Let the punishment be this:
A Senator remaining truant more than three (3) days in violation of the compulsory attendance requirement shall be deemed to have vacated their elected office, their seat shall be declared vacant, and a replacement shall be determined by Special Election.
Said former Senator's pay shall be paid on a pro rata basis only for days served during the calendar year, the Senator's benefit agreements shall be deemed null and void on the basis of the Senator's failure to failure to meet contractual obligations, and all continuing benefits otherwise enjoyed by former Senate officeholders shall be terminated.
Suunds fair to me.