Input on whether a deal could work self-funded

Looking at an accounting deal that I like, which is ~350k in EBITDA, and seller wants $3M (I can do $1.5M cash up front, ~$1M seller financing, with $500k forgivable seller note). I know this is an expensive valuation, but the seller won't budge.

The business itself is ~$900k in recurring revenue, 25% growth, ~25 customers, and has one customer representing 20% of revenue.

I'm wondering if this deal could theoretically get funded by SBA, or if anyone has more creative ways to get this deal done? I would envision this being the start of a roll-up play to acquire a few others and bring them together to build a bigger platform, but I'm trying to determine whether I can proceed on this one as a starting point at all given the small size and high valuation.