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the porsche doesn't seem to fill any gap in your life though, you already have a porsche that you could end up disliking because, well, yellow is better than silver.
why not get an old 4x4 or a pick up to do up, and cart round your mountain bikes?
e.g. https://www.ebay.co.uk/itm/1978-CHEVROLET-C10-PICK-UP-305ci-AUTO-ORIGINAL-50-000-MILES-PROJECT/392524875527?hash=item5b644e4707:g:xWcAAOSwK~tdxVlq
I'm 43, with no kids and a tiny mortgage - my situation is unusual, but does result in the slightly higher disposable than usual.