Ask an Immigration Solicitor. Get an Answer ASAP.
In order to apply for British citizenship you will need to prove that you have 5 years continuous residence in the UK prior to your application. I understand you have been visiting the UK occasionally and not exceeding the 2 years absence rule this means that it is unlikely you would have 5 years continuous residence. Purchasing a property and establishing a company in the UK only supports the view that you have connections in the UK for the purposes of retaining your settled status (ILR).
With regard to your wife, you will first of all have to return to the UK to live and work in order for your wife to be able to apply for a spouse visa. Your wife is not able to apply for ILR just yet until she has been granted a spouse visa for 5 years.
To apply for a biometric card, you would need to make a No Time Limit application using the NTL form.
You need to be physically present in the UK. You are not applying for a biometric card, you are applying to transfer your ILR to a biometric card. It doesnt complicate your ILR, it a transfer of status unless you have been away from the UK for more than 2 years.