TRV with pipes coming from wall directly behind radiator

My house is plumbed with 1/2" to the radiators and the pipes on the ground floor come from the wall directly behind and at the same level as the valve. The radiators all have 3/4" tails and the manual valve is a 1/2"to 3/4". I was looking to fit TRVs but because of both the orientation of the pipes and the need for 1/2 to 3/4" TRV valves the head will stick out from the radiator. I'm thinking to change the tail on this end of the radiators to a 1/2" one and then I can use 1/2" TRV valves and orientate the TRV inline with the rad/wall. Is this possible and will it work? Thanks in advance.