You, sir, ARE AN IDIOT!!! Nah, just kidding. We know you're a little sensitive about the issue, so we wanted to be delicate. (Really. We're kidding. It's not a bad idea. You can remove your fist from the monitor now.)
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Okay, our real thoughts. We like to give concrete answers. No-BS advice. We like to give you a clear directive, as opposed to a slippery "On the one hand" and "On the other hand."
We also like to make exceptions.
On the one hand:
Sure, perhaps your idea is a little unconventional, but only the stodgy traditionalists will really give a shit. Most people will say, Ahhhhhhwwww... he's with his mother! That's what makes this wacky idea acceptable. If you just walked down the aisle by yourself, it would smack of arrogance. But walking with Mom? Suddenly you're a big teddy bear.
If this means a lot to you, and if--this is big--IF the bride is truly onboard, then screw it, go for it.
On the other hand:
In the traditional scenario, you have more spotlight than you think. When you're standing at the altar with a goofy grin on your face, it's a long, loooooooong time on the pedestal. In reality it's seconds but it will feel like hours. Until the procession starts, all eyes are on you. You'll feel it.
To clarify: we are not suggesting that you abandon your idea. But it's worth reevaluating your perspective that you are the "smallest character" in the wedding. When you're standing by the altar, you'll feel like you're exposed to the world. And you are.
The final analysis: Don't listen to the pinheads who are mortified by change, go with your gut, but, above all else, be respectful to your bride's wishes. If you embarrass her, you fail.