Re: The keyer part of your question.
Most rigs nowadays have a keyer built in.
Your documentation should make it clear enough. If it talks about "iambic" versus "noniambic" somewhere in the documentation, it supports paddles.
It boils down, in practice, to whether the rig's keyer accepts stereo plugs and electronically keys the rig for so-and-so length of time based on which "channel" is grounded (one for dot, one for dash, obviously). That would be your paddles.
If the rig's plug is monoral only, you'll need to add a keyer to your paddles.
If it supports paddles directly, it will be well-documented, because it will have to have some sort of interface to set the keying speed.
You can even run a keyer set for "iambic" non-iambically and usually, you can turn off the whole "iambic" thing, too, if it bothers you. Not everone does the iambic bit.
So, don't let that put you off. In my experience of several different keys and paddles, you can be on the air for much longer periods of time with any sort of dual paddle keyer, iambic or not as you please.