You can try app.mutinywallet.com in the web browser on that phone.
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mutinywallet.com
that domain is not "self-custodial"... you said yourself... run your own node / domain. not your domain = not your node... or we get back to WoS domains?
btw... did you ever tried to install a latest web browser on an android 5? LOL where is that security expert Tony Giorgio, recommending to run an old browser that will keep the node keys ?
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Plus, the phones am looking at have no access to google play US
OP literally said "no google services" and you still send a playstore link LOL At least give a github apk link.
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google play US
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Wow, a real challenge for an android 5...
  1. the hardware is really slow and limited.
  2. this mobile device will be good only as "a cold wallet" offline.
  3. I do not think any of actual wallet app will run on that old device.
  4. I tested many android devices but not older than android 7... 5 is really too old.
  5. You could try an update to Lineage, with a android 7 at least, but not sure if that hardware still support it.