To me a Friday morning wedding would say "We're getting married, come if you can, but we get that you probably won't be able too"...or well something along those lines. In other words, it's not a high priority to you that all of your guests be able to make it. Which is perfectly fine and acceptable. And as long as you and your fiance are willing to accept that, then I think you're fine to do so.
And I mean really accept it, look at your guest list, figure out who works typical M-F 8-5 jobs or who is in school, aren't closely related to you, and assume getting a no from them. If you do that and can say "Yes, we're ok those people won't come" then plan your wedding and send out the invites. And to be clear, still invite those people, they might be very willing to take time off, but expect a No and hope for a Yes.
For those who are putting up a fuss, I'd figure out exactly what the wedding/reception you're planning is gonna cost you, then figure out what the wedding/reception they want you to have is gonna cost you. Then the next time they bring it up say "A day time wedding will only cost $1000, what you want us to have will cost $5000, if you want to provide the extra $4000, we'll be happy to discuss it with you", of course use this idea with caution. They might actually pony up the money and it's up to you to decide if that's something you'd be ok with.