The DVLA will not accept any other than a cert issued by a DVSA authorised
inspection centre , and they are only in UK .

If you are on a aus registered bike in UK , then if it has been in UK more than 6 months it should possibly be registered in UK , you are risking having it siezed by police . There is guidance on the GOVUK website ( https://www.gov.uk/importing-vehicle...porary-imports) They are increasing action on foreign registered vehicles , due mostly to abuses of the system in EU by EU migrants to UK , who are using insurance issued in their home country , which is technically invalid, and results in car being seized, untill they comply .

I dont see why you cant insure your bike in UK there is no requirement to have MOT , other than the condition that you maintain vehicle in a road worthy condition , which could be checked in event of a claim .
You will find it almost impossible to get a insurance that is valid as part of EU laws require that insurance is issued by the country where the vehicle is registered and covers liability thruout the EU .
There has also been uncovered some dodgy MOT centres who were issuing MOT to RVs without them returning to UK from such as Spain .
So looks like your only answer will be return it to UK on route to Europe,there is a consultation underway for unifying acceptance of MOT issued in any EU country but at the moment this is only looking at heavy goods vehicles, so not likely to be able to address your problem in future .
HTSH

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Current : 2007 Mowag Bucher Duro 6x6 Motorhome , 2006 Sedici 4x4, 2007 Range Rover supercharged

Have a word with Direct Line Spain (English speaking)
https://www.lineadirecta.com/Recurso.../Ventajas.html

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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)

I have had no trouble insuring a bike with no MOT and no road tax here in UK.
The bike was not being used for a couple of months so there was no point with tax & MOT, I just wanted it covered in the event of theft from garage. But in reality the bike could have been anywhere in the world. Of course in the event of a claim.......being "anywhere" would have implications !

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Regards Tim

Learning my craft for the big stuff, it won't be long now and it's not that far anyway

I've only just seen this thread, so hopefully the OP's issue has long since been resolved.

Tacr2man, migrants may be having their vehicles seized because they are abusing the system in keeping EU registered cars in the UK for more than 6 months, but you are incorrect in your assertion that their EU insurance is technically invalid.

This is a common misconception, perpetuated by UK and Irish insurers. Under the European Insurance Directive, all motor insurance sold within the EU must provide the minimum legal third party cover for cross border travel (EU) for the duration of the policy, normally 12 months. However, most UK and Irish insurers typically place a limit of between 30 and 45 days on trip duration, by offering customers the same cover at abroad (in the EU) as they have at home for those trips, e.g. fully comp plus breakdown cover - providing they adhere to certain terms and conditions.

However, as long as you accept that theft, damage or breakdown of your own vehicle will not be covered by your UK or Irish policy if you exceed the trip duration specified by your insurer, you can legally travel throughout the EU for the duration of your policy: https://www.gov.uk/vehicle-insurance/driving-abroad.