It might be possible, but would involve several issues. The 8444A was designed to be used with an 8554A/L, 8555A, and later an 8558A, and later still with and 8568A/B. Does the 8444A have the internal 500MHz oscillator option - options 058 or 059, if not you would have to supply an external 500MHz stable @10dBm or higher. IIRCC, the expected sweep voltage is 0 to +10V, the 8569B does have an external sweep ramp that I believe is also 0 to +10V, but the sweep ramp linearity may not match exactly, in which case you would need to make a sweep offset/gain matching circuit (as described in the 8566A OP/Serv manual, under alignment tools). The track gen sweep range will very much depend on the low band sweep of the 8569B - probably 10MHz - 1.3GHz, or 1.55GHz max. The low band on the 8569B is 10MHz to 1.8GHz in full band sweep - the 8444A cannot go that high, so you cannot use full band sweep, but can set the 8569B to sweep from 10MHz to 1.5GHz in the MHz per div sweep mode. An external sweep trigger is required to sync the sweep, this should come from the 8569B.
Don Bitters
