Insurance - new for old cover for > 3 yo bike

I appreciate insurance is an ever-present topic, but it's usually addressed in respect of new bikes.
Looking to get some cover in place with eldest son taking bike to Uni, but the bike is over 3 years old so it looks like most providers head down the "market value" route rather than new replacement. Home cover not available, so stand alone policy is what we'll be needing. Uni cover appears expensive and seems to have the same market value flaw.
Anyone know of insurers who extend the cover so that a £1400 bike 3 years ago would be replaced by something of a similar spec but brand new? Or alternatively just pay out the £££ value that you ask to be insured? (I appreciate from the insurer's perspective that is a bit of a blank cheque, but if the policy is contingent on the price of the bike which most seem to be, it seems only fair for the cover to match that in some way).
Looking to get some cover in place with eldest son taking bike to Uni, but the bike is over 3 years old so it looks like most providers head down the "market value" route rather than new replacement. Home cover not available, so stand alone policy is what we'll be needing. Uni cover appears expensive and seems to have the same market value flaw.
Anyone know of insurers who extend the cover so that a £1400 bike 3 years ago would be replaced by something of a similar spec but brand new? Or alternatively just pay out the £££ value that you ask to be insured? (I appreciate from the insurer's perspective that is a bit of a blank cheque, but if the policy is contingent on the price of the bike which most seem to be, it seems only fair for the cover to match that in some way).
2015 Canyon Nerve AL 6.0 (son #1's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
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Accommodation has secure facility, insurance covers theft (if appropriately purchased) and Sold Secure Gold lock already acquired. There comes a point at which 18 year old men start to take their own risks, and he's paying for the insurance!
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
Is it possible to have it covered as an extension on your contents insurance?
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)
Bird Aeris 120 | Boardman Team 650b | Boardman Pro FS | Calibre Two.two
2011 Specialized Hardrock Sport Disc (son #4s)
2013 Decathlon Triban 3 (red) (mine)
2019 Hoy Bonaly 26" Disc (son #2s)
2018 Voodoo Bizango (mine)
2018 Voodoo Maji (wife's)