I doubt rims will be an issue but you'll need the corresponding straight pull spokes in whatever new length you need. Are they proprietary or can you use any centre-pull spokes?
I'd guess the cost of getting spokes that fit would eat up any saving vs using novatecs / similar. Plus making them less future-proof if anything breaks.
As in ones with hubs/spokes like these?
http://brimages.bikeboardmedia.netdna-cdn.com/wp-content/uploads/2010/07/2011-mavic-ksyrium-sl-4.jpg
I doubt rims will be an issue but you'll need the corresponding straight pull spokes in whatever new length you need. Are they proprietary or can you use any centre-pull spokes?
I'd guess the cost of getting spokes that fit would eat up any saving vs using novatecs / similar. Plus making them less future-proof if anything breaks.