I've not seen an aftermarket TFHSS one, just FHSS and SFHSS.
I run a T4GRS too and for my other cars I bought a few R202 and R203GFs. They are SFHSS and work fine with the T4GRS, just a smidge slower (which my thumbs can't even notice) and without telemetry. They're around £24 new for a 202GF.
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Back from 30 year retirement finding use for my thumbs again, slowly getting faster!
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