1) I wouldn't trust it.
I think that each half of the variants of 3M's Dual Lock (
https://www.3m.com/3M/en_US/dual-lock-reclosable-fasteners-us/) fasteners (which are issued here with an EZ-Pass, for instance) would stick okay
to each other, but I would worry that the adhesive-to-bike plastic would hold up (even with thoroughly cleaning the bike's surface with alcohol). I certainly wouldn't trust my $1,000+ phone to one; OTOH, if you'll be using some mostly obsolete, superseded, phone for, say, a GPS or a music player, then that would take some of the worry out.
2) Another RAM possibility:
In addition to what
@rongrimes posted regarding his use of the RAM mirror-stem mount, you might be interested in the RAM ball I added to my C 400 GT:
https://rammount.com/products/RAM-B-252U
I put this inboard of the left bar-end weight, no drilling, no cutting, etc., needed:
View attachment 3524
I'm not very familiar with the CE-04, but I'm guessing that they have screw-on bar ends of some sort, correct?
And I realize that there's a certain potential advantage of your system, in terms of a center position, but you shouldn't be looking at a phone that much, anyway.
3) Be careful of vibrations for some phones:
If we are talking about an expensive iPhone here (and perhaps some other brands, but I don't follow them), you might want to be careful about vibrations.
I'm guessing that the CE-04, being non-ICE and all, is probably pretty smooth. OTOH, I've read some posts on the forum here about intrusive vibrations on them, at least under certain conditions.
So, with that said, here's a summary on the Apple issue from a year ago, in RideApart:
Apple issued a warning to iPhone users who ride motorcycles, advising that some motorbike vibrations can possibly damage certain iPhones if mounted on bikes.
www.rideapart.com
And here's Apple's actual note:
Exposing your iPhone to high amplitude vibrations within certain frequency ranges, specifically those generated by high-power motorcycle engines, can degrade the performance of the camera system.
support.apple.com
Even though I only use my phone for a GPS on my bikes once or twice a year (I don't mind getting lost, during my day trips, but sometimes I visit someone with a very rural address), after I read those articles I promptly upgraded my mount. That is, I already had a Hondo Garage Perfect Squeeze (
https://hondogarage.com/collections/phone-mounting-systems-motorcycle), so I then ordered their vibration dampener (which, unfortunately, is fairly bulky).
If I were starting from scratch, I'd probably order a system from Quad Lock (
https://www.quadlockcase.com/collections/shop-motorcycle). They have a more compact setup, including their more integrated optional vibration dampener. The downside of their systems -- which, to me, look very convenient and very well made -- is that you have to use one of their cases for your phone, which might be something someone like me does not want to do. (I like my current case, which has room for my license and a credit card, and the whole shebang can be securely mounted in a Perfect Squeeze.)
Another possibility is a setup from Peak Design (
https://www.peakdesign.com/collections/mobile#addon-sub). I'm not very familiar with their products, but one of them got a favorable review in Motorcycle.com, as I recall, and their systems have a vibration dampener.
Those are the only three outfits that I'm aware that have specific anti-vibration motorcycle mounts, and I try to keep up with the subject.
In any case, good luck with your project.
