Guy Walsh: http://www.teleskop-express.de/shop/product_info.php/language/en/info/p2165_Filterschublade-inkl--1-Einschub-fuer-1-25--Filter---kurzbauend.html
Or two Baader adapters for permanent solution - continuous female T2 with 1,25" thread and continuous male T2. You screw that to the camera T2 threaded and you can mount a 1,25" filter quite close to the sensor.