Replace central heating gate valve with 2-port valve plumbing advice

Replace central heating gate valve with 2-port valve My house has a separate central heating loop that heats an annex. The annex loop has 3 x radiators (all with TRV), pump (manually switched) and a gate valve. The gate valve is very awkwardly sited, and difficult to operate, so I am wondering whether it is a good idea to replace this with 2-port zoning valve that is controlled by the pump switch. So pump off = port vv shut, and pump on = port vv open.

Any thoughts gratefully received

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