If you're handy with wood-working tools, a set of grip inserts isn't hard at all for the SP101 or the GP100, as the back portion of these grip panels are totally flat. Too, the exisitng panels may be used as patterns both for cutting to shape, and for drilling. (drill first, then using the drilled hole for an index point, then mark and cut your panels) I've made really nice grips for both models listed in the past from Cherry and one set in Myrtlewood. Neither set took longer than a Saturday Afternoon, and the hardwood for each set cost less than three bucks buying hardwood scrap from dealer's trim bins!
Who knows.... maybe you'll make a career move! <!--emo&

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Just a thought!
God Bless,
Marshall