You can get flat bosses instead of the curved ones.
Think it's something like this
https://www.cyclebasket.com/m9b14s357p2317/Shimano_SL-6208_Flat_Lever_Boss_Cover/RS_GB?gclid=Cj0KEQjwioHIBRCes6nP56Ti1IsBEiQAxxb5G-JPbDCJTxp_oJOTXH1IFufOGnktNRBJXTko2Fq6YEoaAl4E8P8HAQ
As far as I know you can use standard downtube shifters with them, but will happily be corrected otherwise
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You can get flat bosses instead of the curved ones.
Think it's something like this
https://www.cyclebasket.com/m9b14s357p2317/Shimano_SL-6208_Flat_Lever_Boss_Cover/RS_GB?gclid=Cj0KEQjwioHIBRCes6nP56Ti1IsBEiQAxxb5G-JPbDCJTxp_oJOTXH1IFufOGnktNRBJXTko2Fq6YEoaAl4E8P8HAQ
As far as I know you can use standard downtube shifters with them, but will happily be corrected otherwise