Hi, unlikely to find any valve with 1500 centers, however a small problem as I think you may have one to many 0 and really mean 150mm.
The Triton bar showers have offset spigots that will swivel down to 150 (6").
Can you post a make/model of the existing or a pic please.
https://www.tritonshowers.co.uk/mixer-showers/eden-bar-mixer-shower.htmlI'll see what I can find, is there a cost range?