You can keep your personal tiddlywiki in one format and have the exported blog in another.
In the tw\tiddlers\
keep a file called $__theme.tid
containing the name of the style you wish to use e.g. using $:/themes/welford/phasersonkill-static
created: 20150620130427249
modified: 20151207212411514
title: $:/theme
type: text/vnd.tiddlywiki
$:/themes/welford/phasersonkill-static
Any style you use will need to be included in your personal tiddlywiki or as a plugin in the tw/plugins
folder. It's probably easier to have it contained within your own tiddlywiki but not as the active theme.
See https://github.com/welford/twstaticblog/tree/master/example/export-styled.bat
Same as above, but using a file called $__palette.tid
:
created: 20170408201459621
modified: 20170408201500717
title: $:/palette
type: text/vnd.tiddlywiki
$:/palettes/welford/phasersonkill
See https://github.com/welford/twstaticblog/tree/master/example/export-styled.bat