Ive straightened steel cranks
take them off and clamp the bb end of the crank in the vice
then slip a scaffold pole over the arm and lever it straight.
It might be bent sideways as well as into the bike. can clamp an adjustable spanner on the pedal end of crank. then use the scaffold pole over its handle to straighten that.
as said by Jacksbike. The crank length and cog size is likely to be bigger on the Sports.
the actual spindle diameter will be the same though.
Raleigh used there own size, so its difficult fitting other manufacturers cranks on Raleigh spindles