Paul,
If you can, it's worth doing something similar to how Vince Abbott changed his Hawk steering shaft.
It would need some very professional welding/fabrication though.
See Vince's photos below:
Also, have you got a cast UJ to go onto the pinion?
These take up more space than the OE Triumph Herald/Spitfire Flexi-joint, (and will impact whatever rubber boot arrangement you use) but will last a lot longer.
Cast (Triumph GT6/group 4 Escort etc.) joint photo also below:
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