Hmm, I cannot follow your conclusions ...
You have a G5 as a top of crowd PPC-machine.
And You have the DLSD for on the go.
And in addition the fine Pismo as a nice os9 machine.
With VNC-screensharing (VNCthing on os9) you'll have the G5 at your fingertips to browse the web.
Even if there were no new restrictive security hurdles, Classilla & the G3-chip wouldn't cope with the amount of junk, that "modern" internet throws at us and that doesn't make browsing a fun - even on friendly sites, like macintoshgarden.
With your Pismo you'll also have file access to the G5 via Transmit and other ways.
There's no need for any proxy server, since that would only work at home - an at home, there's the G5 and the DLSD anyway ...
If I'd like to choose my Clamshell/os9 (which is comparable to the Pismo) to come with me on the go, my equipment would be:
- a Smartphone for Mobile Hotspot, Cloud-access (Dropbox, iCloud, OneCloud, GoogleDrive etc.) and mission-critical websites, like banking etc.
- a (Vonets) WLAN to Ethernet Bridge (to get connected to the Smartphone)
- Classilla for IMAP-mail and "light"-browsing
- NetPresenz/os9 (to make the Clamshell an FTP-Server for file exchange with the Smartphone)
- Goliath for webDAV
That's good fun, making the old stuff still coping with a lot of tasks.
To be honest - currently this won't ever happen, since I like to tinker with the Clamshell/os9 at home but need more/additional features on the go (far beyond web-browsing) ...
When it comes to browsing the internet, them old G3s are a shovel - made to move piles of sand easily.
Todays bloated internet is a bunch of dunes ...
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What about putting it in the PB G4 instead, if that hasn't been given one already?
Yep, the mSata is pretty versatile for both Pismo and DLSD.
(Actually I enyoy an mSATA on both my DLSD and the Clamshell ...)