Possible, but the reality is they are here only 4 days billable a week, with one only being here 3 days a week. Not sure how an “alternate schedule” is much different than what your proposing. Their “full salary” is all relative anyways.
Also not sure about the legality of it, but as a business can you give part time employees benefits? Does having a part time employee on a 401k or a health plan create some legal loophole I’m unaware of? Honestly asking about this. Is it just cause its more expensive to the employeer. So why offer it if they are only contributing a percentage of X to the bottom line as opposed to Full X
If you are only working Mon-Wed, what happens if meetings with suppliers happen on a Friday? Or client presentations are scheduled Thursday?
I could see getting around this easily. Lots of options. Push the meeting, have another designer or creative director present. Skype in. Or if absolutely necessary come in that day. No need to jeopardize your work situation by being inflexible. It would be the same as someone asking you to fly overseas for a week, or to the clients office for the preso. You could easily say no, but you understand it’s part of the job.