Yes you can buy LPG carburetors or make one.
LPG mowers are safer than petrol mowers ,they have no fuel tank evaporation and no fuel spills.
When I finished this mower I looked online at the LPG powered Line Trimmers from America the brand name was LEHR,they had LPG
mowers,outboards,blower vacs and I saw a Video on the operation of the LEHR gas carby,you can buy the LEHR gas carby from spare parts
in America.
I'm thinking maybe for a next LPG project a Victa two stoke running LPG with oil injection and a 4 stroke Line Trimmer with LPG.
Regards
Max.