Hello Franklin,
Another welcome on the board.

I play keyboard and guitar in a band as well.
(mainly 70ties rock)
Downsides are ofcourse the double gear, but as long as all band members help lugging, it shouldn't be a problem.
The other thing is that you need more time for setting up and with the soundcheque you need to play both instruments.
I mostly make it before the drummer is ready though

Make sure you have straplocks on you guitar!
and have room enough BEHIND and aside your keyboard. (this way you can come upforward when playing guitar)
For fast switching I mostly put the guitar on my back around my neck so I need the room to avoid damaged guitars.

Have extra picks lying on your keyboard.

Read setlists upfront as you might end up with continuously switching.

You have to think ahead!
Which means that your keyboard is setup for the next song after playing guitar or your pedal board(if you use one) is ready for the next song after playing keyboard..

Tip:
I use a boss tuner which if switched "on" puts the guitar on standby!
This is very handy when switching to keyboard, to avoid a singin'guitar while playing your keyboard.

Fred