No you wouldn't, the cost would be uneconomical and the amount of post finishing to make a usable injection mould tool would negate any benefit.
Plus you then need an injection moulder that can handle a tool the size of a motorcycle seat.

If the output numbers are low, then direct manufacture via laser sintering in PA12 or similar would be the best option. Many service bureaus would be able to help with tweeking the design to make it fit for purpose and ready for small series production. Anything requiring moulds will have to be justified by the production numbers and the longevity of the moulding materials. Typical silicone moulding would use PU resins which will not last as a finished product.

My background- 20+ yrs in prototyping and Additive Manufacturing and riding motorbikes
(and I run the UK's only PEEK AM centre)