When audaxing, how do you Cope with route sheet faff, or how do you see / place your garmin . I must confess to not owning a garmin , and also confess to not doing an audax for a few year due to comfort issues. It's one thing being tired, but the older I get, the less enjoyable it is feeling every bump.
On the Streetmachine (USS) I have a stem clamped to the derailleur post, pointing back towards me, with the Garmin and bike computer mounted on some sort of accessory bar thing that's part of the stem, so they're between my calves/knees. This is suboptimal, as it means I can only just barely read the map while in motion. Numbers are fine. I often use follow-road routing to improve the clarity of the display. Or, if I'm not in a rush, stop and lean forward. I've done something similar on Barakta's ICE trike, though it only gets used for navigation when I'm riding it.
If there's a routesheet, it lives in a tri-bag mounted forward of the steerer (along with inhaler and on-the-bike nibbles), which is easy to access when stopped, and I try not to need it.
On the Baron (hamster bars) I have a Garmin mount on the handlebars near the stem, like you would on an upright. This puts it quite close to my face (handlebar position on tiller-steering 'bents tends to be dictated by finding the position where they foul neither thighs nor boobs, and you can mostly see the ground - everything else has to work with that), but it means that I can peer under my glasses to read the screen and easily press the buttons. I've got even less room for a routesheet, so it lives in my rack bag for emergencies.
Open-cockpit steering seems to give you loads of room for Stuff. If you don't bash your shins on it...
If I cared more about routesheets, I'd probably experiment with attaching them to a convenient arm or thigh. Some proper audaxers will no doubt be along soon with their solutions...