There are quite a few good resources for cis people to do gender discovery. Meg-John Barker's zine turned printed book I've heard good things about, I'm a fan of theirs in general. S Bear Bergman's stuff isn't specifically aimed at cis people but it doesn't exclude the cis either and would probably be very relevant.
I think the issue with running a workshop, at work, for cis people is that you either put pressure on people to out themselves or you go into it assuming everybody is cis. It's not necessarily the same, but I've been to more general LGBT+ training at work that was all about how straight people could be better allies to those people over there and it was really frustrating. Particularly when it went into things like: this is a safe space to ask all the weird questions about gay people that you might feel ashamed to ask. (Because everybody here is straight and totally comfortable with their straight professional colleagues asking the trainer 'how do lesbians even have sex?' or 'how come gay people have a different accent from normal people?')
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I think the issue with running a workshop, at work, for cis people is that you either put pressure on people to out themselves or you go into it assuming everybody is cis. It's not necessarily the same, but I've been to more general LGBT+ training at work that was all about how straight people could be better allies to those people over there and it was really frustrating. Particularly when it went into things like: this is a safe space to ask all the weird questions about gay people that you might feel ashamed to ask. (Because everybody here is straight and totally comfortable with their straight professional colleagues asking the trainer 'how do lesbians even have sex?' or 'how come gay people have a different accent from normal people?')