Regarding your question how to carry your Deities to different places with you, you should of course always carry them personally if at all possible in a small box or cabinet for the purpose. Then when you come to another temple you may place Them on the altar with the other Deities. That is nice.
Regarding your second question: what determines whether a devotee goes to a Vaikuntha planet or to Goloka Vrndavana?—Those devotees who are following viddhi marg are meant for going to Vaikuntha planets and those who are following raga marg are meant for going to Krsnaloka. It is generally that the followers of Lord Caitanya are going to Goloka Vrndavana. There is no difference between the Vaikuntha planets and Krsnaloka, it is a matter of personal taste only.
I have heard that the Ratha is almost completed in London and it is expected that the Rathayatra Festival will be very, very magnificent. So as you have suggested, this will also be the best opportunity for the several programs to be established by mutual consultation amongst yourselves, yourself, Gurudasa, Syamasundara, Hamsaduta, Mukunda, etc. So please manage everything very nicely and Krsna will provide all opportunities for expanding His movement throughout the European countries. So see that everything is done cooperatively. Then it will be very nice.