Alan,
I spent some time 6 months ago building my access to tiddlywiki on android. In the end I got the most satisfaction from installing termux and installing node JS because that makes tiddlywiki not only browser independent (on android) but also device independent, ie I can access the android wiki on the LAN from my desktop.
I have not yet managed to make it autoload on phone reboot, but that will be a matter of focus.
The above solution of course does not maintain the wiki in a shared location, but it does in someway's allow access from multiple locations.
Regards
Tony