Scott, Dave & Mickey
If having knowledge and consideration to warn others of activities that are at best illegal and worst potentially dangerous is acting as the "elf & safety' gestapo " then I am guilty as charged.
If you wish to partake in an ill advised activity that may endanger others as well as your self, then I can't stop you, but if you insist on suggesting to others procedures that are dangerous or illegal then if I can prevent an incident them I will continue to point out the folly and irresponsibility of others.
With respect of the technicalities of Scotts suggestion.
The new caravan will be designed and certified only for use with 30 mbar gas. Fitting and using a regulator that provides gas at a different pressure will clearly be wrong, both illegal and potentially dangerous.
Whilst it is unlikely that the Elf & safety Gestapo will come knocking on your door asking to check your gas installation, the service company you use may refuse to touch or service the gas appliances as the system is non compliant, and for the same reason you may find that come time to sell (trade in) the dealer may refuse to deal or offer a substantially lower price.
If you have an insurance claim the non approved gas system could give the insurance company a legitimate reason to refuse to pay out.
I understand Dave and Mikey's frustrations with the need to comply with safety regulations, but when you have seen or had to deal with the consequences of ill founded tampering, your attitude may harden.
If not for your own safety think of others, and those who might own the caravan after you, they would have a legitimate claim if it were provable that you deliberately altered and allowed a non compliant gas system to be used.
Now lets look at some positives, The 30mbar systems can be configured with change over valves, but it would mean fitting a dedicated change over valve Speak to your caravan supplier who should be able to obtain and fit the necessary kit.